From @philsward in https://github.com/backdrop/backdrop-issues/issues/4829#issuecomment-781...
Also, both Themes and Modules need a "remove/delete" option to completely delete them from the file system. Once a theme or module is installed through the GUI, there is no way to get rid of it from the GUI.
GitHub Issue #:
5320
Recent comments
He said no...
html5-qrcode input
There is a new solution... I have asked the developer if they would be willing to port it to Backdrop. https://github.com/vasyapledov/scan_code
html5-qrcode input
Hello, @yorkshirepudding! Thanks a lot, I got it, all sorted out.
My layout template (layout--blog.tpl.php) doesn't work