Side bar width on 4k display

I would like to change the width of the side panel. I am using consolidated tabs but my side bar is entirely too wide on a 4k display.
Certainly someone has a solution.

Are you using the "use full width of browser" option in consolidated tabs settings?

tried both ways. After some more changes, the side bar width got smaller. Now I have wasted space on the right side of the 4k monitor. It is difficult to get the right balance of content with 2 cameras.

Have you tried Themeify ?
More information on this here: Pimp my web interface