Hi Alaa,

1. As we informed in documenation, by now SPPB 4.0 do not have back-end editor, it's still under development, stable version of that editor should be ready in next 2 months.
2. If you have back-up of your site to can revert to day (yesterday?) when you have installed SPPB 3.8.x and keep it by now. Don't worry we will support that version to end of summer (2023).
3. In theory you can reinstall with SPPB 3.x but if you already edited some pages - there may be code changes.

Thanks