Style changes to the session settings dialog

[tonoizer]

Issue description

Describe your issue in detail here

Currently our session settings go over the whole screen, this is kinda overkill because there ain't much to show yet.
Currently it looks like this, but this is when the windows is quite small this looks a lot worse when maximized.

Therefore my suggestion is to make it look something like this:

This could be achieve quite simple by adding these two lines in:

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