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I'm a newbie, and I still have a bunch of things to learn here .. This is one of the things that I can't figure out, and I ask for your help.

I have root on SSD, / home partition on HDD. I needed to transfer one Steam game to an SSD. I separated the one I needed on the SSD and now my partitions look like this:
https://imgur.com/Ld1SOhc
https://imgur.com/wsJ0Alr
The problem is that the section with the mount point / none is not visible when trying to add it to the Steam library folder, it is not there:
https://imgur.com/zmduSi8
Please help me solve this problem.

Hello, did you try to create a link (shortcut) of your game folder in your home ? I think it should work