Last time I looked for how to do this, hydrapaper seemed to be the best option. Lately though I get a warning every time flatpak updates.

Info: runtime org.gnome.Platform branch 42 is end-of-life, with reason:
   The GNOME 42 runtime is no longer supported as of March 21, 2023. Please ask your application developer to migrate to a supported platform.
Info: applications using this runtime:
   org.gabmus.hydrapaper

Is there something else people are now using? Or are they staying with hydrapaper (it seems to still work fine)?