I had relatively little issues with this on Debian on my HP Spectre x360 (2019 model I think)
Relevant excerpt from my install log
Setting global scale to 200-250% in KDE 5 and upping a few fonts seems to fix virtually all HiDPI-issues, except for SDDM and the console framebuffer. You may also want to resize the start bar size, but that is personal preference.
Comments
I had relatively little issues with this on Debian on my HP Spectre x360 (2019 model I think)
Relevant excerpt from my install log