Done a cursory search.
Is it possible to have larger tool icons?
I’ve tried editing the tool icon SVG code in an text editor and I’ve used Inkscape to resize but they don’t work.
Icons are scaled by SketchUp. You only get a choice of large or small, which sizes are fixed in SketchUp, not customizable.
I have to say this must be the first time I’ve ever seen someone request larger icons. More often it’s the small ones are too big.
You could scale your screen?
happy with my 2560x1440 screens despite my aging eyes
but I like the aesthetic of a larger tool icon
for my Windows OS I’ve selected larger mouse pointer icons