That’s unusual. Normally, the Touch Docker scales depending on how far you pull it open, and at the size you’ve shown (estimated relative to the Krita interface on my monitor), the icons should at least be clearly visible to the naked eye. But not as tiny as they are for you.
You could try detaching the Touch Docker from its dock position, scaling it to normal size, AND then closing it, restarting Krita, and calling up the Touch Docker again. I can’t promise that it will then be available in the usual size, but I can’t think of anything else to do after two days of testing, and I can’t reproduce your situation.
And actually, you can also integrate all the actions provided by this Docker into your toolbars, then you wouldn’t need this Docker (but I realize that you’re not considering this). And if the three toolbars provided by Krita aren’t enough for you, I could show you how to use more than these three.
Alternatively, you could install the plugin Henrik’s onscreen Krita shortcut buttons or Toolkit Pro, fullscreen touch-friendly toolbox plugin and use it in combination with the Quick Access Manager. If you’re keen to experiment, you can also try the plugin Workflow Buttons, which (very probably) will be integrated into Krita in the future (although I can’t say for sure whether it already works with Krita 5.2.11, but it is already included in the current Krita 5.3.x and 6.x.x nightlies and works).
Michelist