QGIS » QGIS Application

If I choose [Line Layer] -> Right click -> Styles -> Edit Symbol, the width I set there ends up as physical pixels on my 3000x2000 screen with Windows 10 and 175% screen scaling. Actual width of a scaled "5mm" line is less than 3mm. I can live with that.

But a similar thing happens to the "scratch layer" or whatever you call the mechanism that lets us enter a new Line by clicking points and then right clicking. The drawn lines, and the line that follows the cursor to the next click point are nearly invisible, especially if you are tracing over a sat image! And if there are supposed to be markers at the click points, like I see in screenshots of older QGIS versions, they are totally invisible here.

"Spot my line on map.JPG" shows a tiny corner of my project. "Spot my line no map.JPG" is the same with the background hidden. I'll grant I'm miserably color-blind, and maybe that line will jump out for some people. But it is still 100/175 of the size intended, and the scaling has changed it from a string of solid pixels (I assume) to a vague pattern of more-or-less pale pixels with no sharp edges. The only way I've seen to get sharp images inside screen scaled Windows 10 is to disable scaling and run at the hardware resolution, providing your own mechanism for expanding your interface elements appropriately.

Without that, is there any way to hack the width of those "scratch" lines? Or the color? If I could control them like I can the finished result, the line drawing function would be quite usable.