Try toggling off RokPad and just using the normal Joomla editor.
All of the J3 "rok" extensions are considered legacy. They mostly work fine in Joomla 3 and on PHP 7 but none of them were tested through the final iteration of J3 (3.10.12) as they were retired before then.
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Hello Matt, thank you very much for your feedback!
I tried deactivating all ROK plugins - then no content is built in the backend at all.
And in the settings I can select “none” among the editors, but I can’t click “Save” here either...
RokPad is just an alternate editor... it's not tied to any content it was used to write. RokCommon and RokSprocket may be in use powering parts of your theme... like a slideshow or a mosaic or something... those should work well enough with J3 and PHP 7.4
I would suggest disabling ALL 3rd party extensions... maybe you're running another plugin/extensions that only works on J4... the fact that you simply can't click a Save button anymore (is it just grayed out?) feels like a JS issue of some kind...
JCE is a popular editor... you could try their J3 version... but the fact you can't simply toggle back to the default editor seems troubling... Neither TinyMCE (default) or Codemirror work?
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