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I found a partial solution to this problem here: https://danantonielli.com/app-scaling-on-high-dpi-displays-fix-2019/. The solution exactly as described did not work for me. I had to modify the last step, step 6, to select “Application” from the drop-down rather than “System (enhanced)”. I suggest you try all the options if the recommended one does not work.
The solution is partial in that it made the cursor over the picture larger, but it also made the pull-up/down arrows that display the “Library Develop…” menu and the loupe very small; however, I find the very small pull-up/down arrows more tolerable than the tiny cursor over the picture.