If you select a bunch of sessions, right click, "Batch Edit>Edit Sessions (session type settings)", the General and Connection tabs require checking the edit in batch checkbox before you can make changes. Since I right clicked on the sessions and chose "batch edit", it's obvious I want to edit them. The checkbox seems unnecessary.
Just a thought.
This is actually by design to enable the case where you want to batch editing the RDP behaviour without effecting the credentials & geteway settings.
If left unchecked they won't get assigned. In the case where you check it but leave the values blank we clear (set to blank) all the values.