Hi,

1. Please go to Appearance → Customize → Custom CSS then add the following custom CSS code:

.header-search-style-showup .pc-wrapbuilder-header .show-search {
    box-shadow: none;
}

2. Add the following CSS code:

.header-search-style-showup .show-search {
    padding: 5px;
}

3. Please send me the screenshot of this issue.

Regards,
PenciDesign.

Hi,

Following this case, you need to add the custom breakpoint by following the document here: https://elementor.com/help/additional-breakpoints/

Next, edit all the pages with the Elementor, switch to the breakpoint you've created then modify all the spacing.

Regards,
PenciDesign.

Hi,

1. Yes. That's right.

2. The WordPress archive pages were built with the customizer settings, so you can't edit them with the Elementor. If you want to create an archive page with the Elementor, please follow the document here: https://soledad.pencidesign.net/soledad-document/#archive_page

Regards,
PenciDesign.

Hi,

Please go to Appearance → Customize → Custom CSS then add the following custom CSS code:

h2.penci-psub-title {
    font-weight: 500;
}

Change 500 with the font-weight value you want to show.

Regards,
PenciDesign.