Thanks for trying to help, I have the same problem but this isn't helping.
By scaling the text either my high dpi main screen gets too small or my low dpi external screen gets too big. Either way, one of them is always useless.
This is only happening with lightroom, premier seems to have no problem with scaling both correctly.
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as @ellas56972775 is mentioning, this is not helping...
here are some photos to help understand the issue (mind you these screens are side-by-side, so this is not perspective making the interface on one look so big, one is a 27" regular dpi, the other a 15" hi-dpi [notebook] screen:
For comparison, here's PremierePro, which handles it well (interface windows/fonts appear the same (perceived@) size on both screens):
Couldn't have explained it any better. I have exactly the same thing going on.
Sorry for responding late.
Could you please check what is the DPI setting for both of your monitors?
Also, Do you have switchable graphics for multiple monitors? See Troubleshoot Photoshop graphics processor (GPU) and graphics driver issues (Step 7)
Display scaling is set to 200% on the Hi-Res Screen and to 100% on the regular-res Screen.
Yes I do have switchable graphics (Intel HD P630 and NVidia Quadro M1200). Both Photoshop and Lightroom (i can't find sniffer.exe) are set to use the high-performance Nvidia card within the Nvidia control panel.
What really astonishes me though, is that as I've mentioned before, indesign, illustrator, muse, dreamweaver, premiere pro, bridge all handle the situation well. But Lightroom and Photoshop are having a hard time (so does Google Chrome by the way, must be something to do with how all these apps tell Windows which scaling to use on what window/panel).
Issue still NOT solved.
I figured out an interim work-around... BUT PLEASE FIX THIS.
Overriding the high DPI scaling behavior within the file properties of the programs make the dual screen setup more usable. I found "System" to be the best setting for Photoshop, for Lightroom both "System" and "System (Enhanced)" delivered okay results.
be aware that this will also scale the opened images, hence NOT take full advantage of the hi-Res Screen -- which, in Lightroom actually is a okay for me, because the hi-res previews were putting quite the workload on the system. (switching which monitor is primary and which is secondary within lightroom will still cause some screwy behaviour but at least most things work well this way [and the identity plate setup is usable this way too!].)