Title, I installed my system with two partitions, a big one and a small one for the OS. I figured 100GB would be enough for the OS one, but apparently not as it keeps filling up. Steam keeps filling it for some reason, something to do with Proton. I know that messing with partition sizes has a risk of data loss and all that, and I don’t really want to lose parts of my OS.
I had this issue recently. I deleted a few of the older versions of Proton that had accrued, as well as a couple of OS images I had pinned (ostree on Bazzite). Removed something like 12GB