Themelia problems after switching to SSL

Is Themelia fully compatible with SSL (https://), and if so, is there anything I have to do to make Themelia work properly with https://?

I’ve been using Themelia on my WordPress-based Web site since late May 2020, and it worked fine, but upon implementing SSL and changing my site over to https://, Themelia does not appear to be functioning properly. When I go to the Theme customization area, I no longer get all of the tabs along the left side as before and it says “Customize:loading” in the browser’s title tab as if the Customize page has not finished loading. Only Widgets shows up there, not all of the other choices that were there before such as Custom CSS. Also, my site no longer has the proper look for the top menu.

Are there spots in the WordPress database or Themelia theme files where I need to replace http with https for Themelia to work properly? My Web site itself does work and another theme appears to work properly, but even when I uninstall Themelia and reinstall it, that doesn’t fix the problems.

Thank you for creating the free Themelia theme and for any help you can provide.