I wanted to try out the "Advanced Project Settings" option in Unity Hub, mostly to be able to trigger my own method on the Editor start. Unfortunately, it wouldn't work. The arguments I would type weren't saved: after hitting "Done", and opening the Advanced Project Settings again, the textarea would be empty, only displaying the "e.g. "batchmode -logfile" example. Willing to capture on video to report the bug, I started clearing my project list. After this, I added a new project. This effectively solved my bug: anything entered in the Advanced Project Settings is now saved properly. So, if anyone ends up with the same problem, try and remove all your projects from the Hub.