Did you try non-beta version (v1.2.39)?
Viewing post in Theme Preferences for Aseprite comments
okay it worked in 1.2.39, but after changing background color to pink and hitting apply i got this: https://postimg.cc/LYkTXjXg all menus are unreadable now.
(i use a different version for my work anyway, so its whatever, but anyone else trying this for the first time should make a backup)
As a last resort, if nothing helps you can go to your Aseprite preferences folder, delete the theme-preferences
folder, and restart Aseprite.
This will hard delete the extension.
(I’ll add this instruction to a troubleshooting section)
As a last resort, if nothing helps you can go to your Aseprite preferences folder, delete the theme-preferences
folder, and restart Aseprite.
This will hard delete the extension.