[Enhancement Request] Add option to remove preview pane

I just tried Runbox 7, but will revert to Runbox 6. As soon as it started, it was unacceptable: to me a preview pane is a useless waste of real estate. Add an option that is saved/preserved option that removes that pane.

I agree totally.
I prefer substance over designer “Oh! isn’t that cool.” adolescent ■■■■.