Let me preface this by saying that I am an "older" user of Krita (as in age, not experience) and use the programme on a 4K monitor. As such I have a hard time seeing some of the really tiny icons in the Dockers, etc. I LOVE the fact that you give the user the chance to change the size of the icons used in the Toolbox (something Adobe just kept ignoring from requests for many years, and still have not implemented, to my knowledge).

HOWEVER, the icons in some of the Dockers - for example the Brush Presets - are very small and virtually impossible to guess at their use if one's eyesight requires the user to sit at a constant distance from the monitor and using glasses. Using a mouse one has to let the icon description pop up to describe it. Using a pen and tablet that is not so easy; holding the pen still and steady above the icon is an excercise in frustration.

SO, this leads me to request a feature to be added that would allow the user to enlarge the icons just as you allow in the Toolbox....

This brings me to a small little bug that I'm not sure is worth actually making an official report about: When I start Krita right now I have as the default Brush Presets the ones called Deevad-V8 and the icons are nice and LARGE in the Docker. Very easy to see. If I then change the Brush Presets to show ALL the icons revert back to very small ones. If I then click back to load the Deevad-V8 brushes the icons remain small, as do all others from that point on.

I believe you can resize the thumbnails in the brush docker with ctrl+scrolling. Best of luck!