Love the mod. I include it in my "mandatory for every playthrough" modlist. Unfortunately in my use case it clutters interface a quite a bit.
I pretty much prefer it to the default quickbar, which I use only for blueprints. That, however eats screen real estate fast.
My first suggestion is mouse hover
Would love to see an option to make specific toolbar transparent or hide it completely. Then, when cursor is hovering above the window - show it normally.

Second suggestion is customizable button scale.
Right now toolbars are linked to global interface scale. I wonder if it's possible to set it separately. It would be especially great, if there was an ability to set scaling for individual toolbars.

Thanks,

1. Do you use double click on a header to expand/collapse and the single section mode?
   In the first versions I've made it semi-transparent but it was too messy and some players didn't like it. You can write your mode which will change styles to make transparent.
   I could think about expanding when hovered over a header and collapsing when a toolbar is left.

2. There is no way to turn off or override interface scaling. It probably would be possible to do it but it would require rewriting whole scaling mechanic from scratch, way too much work.