cross-posted from: https://piefed.zip/c/linuxmemes@lemmy.world/p/1899107/of-course
You're confusing OpenOffice (dead project pretty much, hasn't seen updates in ages) with OnlyOffice (the Russian one with the licensing shenanigans and "AI first" stuff, UI is M365-like and very similar to the LibreOffice "Tabbed" UI)