Hi there!
Thanks for your query.
Yes, the SPPB 4 only has the frontend editor, no more backend. If you click on the settings here: https://photos.app.goo.gl/DcmgfgbvSqunBvZCA then you will find pages option.
Here is the new documentation link of SPPB 4:
https://www.joomshaper.com/documentation/sp-page-builder/sp-page-builder-4/first-look
However, please check and fulfill the technical requirements and PHP configurations. Our products support upto PHP 8.0(maximum).
Hope this helps anyways.
Best Regards