Install profiles can define dependencies: modules that are required before the profile can be installed (see https://www.drupal.org/docs/7/creating-distributions/how-to-write-a-drup...). I'd like to suggest allowing dependencies to cover other types or projects as well (e.g. themes and layouts).
Related issues: https://github.com/backdrop/backdrop-issues/issues/3924
GitHub Issue #:
3926
Recent comments
In case anybody comes back to this, I think I found the problem. The dropdowns disappear only on pages that do not have any images in the image gallery field. That's because mosaic_grid's JS was...
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Some themes have a dedicated spot in the settings that you can add a few bits of custom CSS for the element you want or you could use CSS Injector I'm not sure which progress bar you mean...
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I have just checked on Windows 11 and get no warnings on download. I also scanned the zip with Windows Defender and Malwarebytes and it was all clean.
Virus warning on 1.29.3 download