If you’re talking about the more limited set of options you get when you right click a file in Windows 11, just hold shift while right clicking to get the original options. You’ve actually been able to hold shift to get additional options going way back, I think to windows XP.
There’s a lot of extra useful options in there too like opening command prompts to the current folder and copying file paths to the clipboard.
Thingiverse was stagnant and underdeveloped for many years and borderline unusable at times, so a lot of people feel pretty strongly about migrating to other sites.