Tab Selected: White Border ?

Also, can I make buttons automatically shrink and resize in a custom layout. When one button is clicked it shows the icons and text, and the other buttons shrink, not displaying any icons or works, or strictly just icons, or strictly just text, probably not, I have to ask ?
Can I Reverse panels with a button or Qt as shown here ? If I want to have explorer on one side, when I work, for example then switch it back, anytime.
