Hi,

If you want to do that, please open soledad/js/main.js and on line 265, replace this code:

/* Owl Slider General
     ---------------------------------------------------------------*/
    PENCI.owl_slider = function () {
        if ( $().owlCarousel ) {
            $( '.penci-owl-carousel-slider' ).each( function () {
                var $this = $( this ),
                    $auto = true,
                    $dots = false,
                    $nav = true,
                    $loop = true,
                    $rtl = false,
                    $dataauto = $this.data( 'auto' ),
                    $items_desktop = 1,
                    $items_tablet = 1,
                    $items_tabsmall = 1,
                    $speed = 600,
                    $item = 1,
                    $autotime = 5000,
                    $datalazy = false;
                if( $('html').attr('dir') === 'rtl' ) {
                    $rtl = true;
                }
                if ( $this.attr('data-dots') ) {
                    $dots = true;
                }
                if ( $this.attr('data-loop') ) {
                    $loop = false;
                }
                if ( $this.attr('data-nav') ) {
                    $nav = false;
                }
                if ( $this.attr('data-desktop') ) {
                    $items_desktop = parseInt( $this.data('desktop') );
                }
                if ( $this.attr('data-tablet') ) {
                    $items_tablet = parseInt( $this.data('tablet') );
                }
                if ( $this.attr('data-tabsmall') ) {
                    $items_tabsmall = parseInt( $this.data('tabsmall') );
                }
                if ( $this.attr('data-speed') ) {
                    $speed = parseInt( $this.data('speed') );
                }
                if ( $this.attr('data-autotime') ) {
                    $autotime = parseInt( $this.data('autotime') );
                }
                if ( $this.attr('data-item') ) {
                    $item = parseInt( $this.data('item') );
                }
                if ( $this.attr('data-lazy') ) {
                    $datalazy = true;
                }
                var owl_args = {
                    loop              : $loop,
                    rtl               : $rtl,
                    margin            : 0,
                    items             : $item,
                    slideBy           : $item,
                    lazyLoad          : $datalazy,
                    navSpeed          : $speed,
                    dotsSpeed         : $speed,
                    nav               : $nav,
                    dots              : $dots,
                    navText           : ['<i class="fa fa-angle-left"></i>', '<i class="fa fa-angle-right"></i>'],
                    autoplay          : $dataauto,
                    autoplayTimeout   : $autotime,
                    autoHeight        : true,
                    autoplayHoverPause: true,
                    autoplaySpeed     : $speed,
                    responsive        : {
                        0   : {
                            items  : 1,
                            slideBy: 1
                        },
                        480 : {
                            items  : $items_tabsmall,
                            slideBy: $items_tabsmall
                        },
                        768 : {
                            items  : $items_tablet,
                            slideBy: $items_tablet
                        },
                        1170: {
                            items  : $items_desktop,
                            slideBy: $items_desktop
                        }
                    }
                };
                if ( $this.hasClass( 'penci-headline-posts' ) ) {
                    owl_args['animateOut'] = 'slideOutUp';
                    owl_args['animateIn'] = 'slideInUp';
                }
                $this.imagesLoaded( function() { $this.owlCarousel( owl_args ); } );
                $this.on('changed.owl.carousel', function(event) {
                    $this.find( '.penci-lazy' ).Lazy( {
                        effect: 'fadeIn',
                        effectTime: 300,
                        scrollDirection: 'both'
                    } );
                });
            } );
        }    // if owlcarousel
    }

To:

/* Owl Slider General
     ---------------------------------------------------------------*/
    PENCI.owl_slider = function () {
        if ( $().owlCarousel ) {
            $( '.penci-owl-carousel-slider' ).each( function () {
                var $this = $( this ),
                    $auto = true,
                    $dots = false,
                    $nav = true,
                    $loop = true,
                    $rtl = false,
                    $dataauto = $this.data( 'auto' ),
                    $items_desktop = 1,
                    $items_tablet = 1,
                    $items_tabsmall = 1,
                    $items_mobile = 1,
                    $speed = 600,
                    $item = 1,
                    $autotime = 5000,
                    $datalazy = false;
                if( $('html').attr('dir') === 'rtl' ) {
                    $rtl = true;
                }
                if ( $this.attr('data-dots') ) {
                    $dots = true;
                }
                if ( $this.attr('data-loop') ) {
                    $loop = false;
                }
                if ( $this.attr('data-nav') ) {
                    $nav = false;
                }
                if ( $this.attr('data-desktop') ) {
                    $items_desktop = parseInt( $this.data('desktop') );
                }
                if ( $this.attr('data-tablet') ) {
                    $items_tablet = parseInt( $this.data('tablet') );
                }
                if ( $this.attr('data-tabsmall') ) {
                    $items_tabsmall = parseInt( $this.data('tabsmall') );
                }
                if ( $this.attr('data-mobile') ) {
                    $items_mobile = parseInt( $this.data('mobile') );
                }
                if ( $this.attr('data-speed') ) {
                    $speed = parseInt( $this.data('speed') );
                }
                if ( $this.attr('data-autotime') ) {
                    $autotime = parseInt( $this.data('autotime') );
                }
                if ( $this.attr('data-item') ) {
                    $item = parseInt( $this.data('item') );
                }
                if ( $this.attr('data-lazy') ) {
                    $datalazy = true;
                }
                var owl_args = {
                    loop              : $loop,
                    rtl               : $rtl,
                    margin            : 0,
                    items             : $item,
                    slideBy           : $item,
                    lazyLoad          : $datalazy,
                    navSpeed          : $speed,
                    dotsSpeed         : $speed,
                    nav               : $nav,
                    dots              : $dots,
                    navText           : ['<i class="fa fa-angle-left"></i>', '<i class="fa fa-angle-right"></i>'],
                    autoplay          : $dataauto,
                    autoplayTimeout   : $autotime,
                    autoHeight        : true,
                    autoplayHoverPause: true,
                    autoplaySpeed     : $speed,
                    responsive        : {
                        0   : {
                            items  : $items_mobile,
                            slideBy: $items_mobile
                        },
                        480 : {
                            items  : $items_tabsmall,
                            slideBy: $items_tabsmall
                        },
                        768 : {
                            items  : $items_tablet,
                            slideBy: $items_tablet
                        },
                        1170: {
                            items  : $items_desktop,
                            slideBy: $items_desktop
                        }
                    }
                };
                if ( $this.hasClass( 'penci-headline-posts' ) ) {
                    owl_args['animateOut'] = 'slideOutUp';
                    owl_args['animateIn'] = 'slideInUp';
                }
                $this.imagesLoaded( function() { $this.owlCarousel( owl_args ); } );
                $this.on('changed.owl.carousel', function(event) {
                    $this.find( '.penci-lazy' ).Lazy( {
                        effect: 'fadeIn',
                        effectTime: 300,
                        scrollDirection: 'both'
                    } );
                });
            } );
        }    // if owlcarousel
    }

After that, open related_posts.php file and add more  data-mobile="2"   like on this image

Best Regards,

PenciDesign