Hi,
Thanks for contacting us and sorry for your issue. Are You Using Javascript Compression?
If yes turn it off in Template Options or inside Compression Plugin, clear Joomla and browser cache, and try again. If you use an additional extension like JCH_Optimizer (or similar) in the highest compression level you have to add exceptions for some .js SPPB files.
https://www.joomshaper.com/images/2022/08/01/off_js.jpg
For more help you can follow this documentation below:
Pages list or Editor Not Working / White screen
-Regards.