On UltraWide screen (and on regular 16:9 if you mostly shot vertical frame) Its lots of horizontal free space and lack of vertical.
Please do option for toolbars can be two (and maybe three) columns for more toolbars can be aviable without scroling.
I also suggest that you think about optimizing the vertical space - now a lot of space is wasted on empty fields - somewhere at the edge there is a short text block (like windows title. top menu etc) and the rest of the screen this field just waste space. Even on 16:9 you have much more horizontal space then vertical. On 21:9 its much more.
Fullscreen mode is better to save vertical space and it is good for laptops, but on a big screen monitor, especially 21:9, this mode can not shrink the window and gets a big empty space in the middle of the screen, especially if the picture being processed is vertically oriented. It takes a lot of widespread mouse movements (and it's especially annoying on a tablet) just to move from the image to the toolbar.
Im add draft for illustrate what i mean.
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