How to re-enable group tab function?

When i downloaded the app, it automatically came with the ability to group tabs, but after i customized several settings it took all of my tabs out of the groups and i can't group them anymore. The settings i changed ranged from privacy to personalization, i tried to reverse some of them to see if that would help and did a bunch of back and forth, but it's still not coming back. (Im trying to leave chrome because i noticed it had some very concerning lack of privacy settings that messed with my phone's ability to function properly if i turned them off. And Edge is worse.) Firefox seems better, but without the group tabs option it makes it waaaay too ridiculous to try and do any real work with it. I do a lot of multitasking and research and need to be able to bounce around and organize stuff. Your help stuff on tab groups doesnt say anything about how to turn it on or off. So... how do i get it back?