Settings affecting the look and feel of the page.
Favicon
Sets a custom Favicon for your site collection.
Not sure what a Favicon is?
Favicon is an icon that is picked up from the website to accompany the site name in the browser tabs and the Bookmarks/Favorites bar.
Logo Link URL
Sets a custom URL for your logo to link to. Leave empty if you don't want your logo to link anywhere.
Compact Styling
This will reduce the spacing between elements like the logo and navbar, paddings in the footer and header and possibly other elements. It works to increase the available content area.
Hide native hub navigation
Hides native hub navigation
Hub navigation position
Have the hub navigation after or before the theme header
Hide native search
Hide native SharePoint search
Hide sidebar
Hides team site sidebar
Hide Page Title
Hides theme’s page title.
Hide Footer
Allows you to hide the footer, increasing the available content area.
Hide Breadcrumb
Hide Breadcrumb from the SharePoint site.
Headings
Apply theme heading typefaces to SPFx content and web parts.