Giant system dialog font on Windows 10

A couple of examples which should be self-explanatory -

Notepad++

Visual Studio

The setup is an XPS13 (3200 x 1800) but the screenshots are from exteal monitors (2 x Dell U2414H 1920 x 1080) with the laptop display disabled. I have logged out and logged back in. The issue isn't present when running the applications on the laptop screen (again, having re-logged-in) so I believe it may be related to the applications thinking they have to upscale the fonts owing to the native high dpi.

In both applications I have tried adjusting the fonts via preferences, without success.

I'm not sure if there's a hidden setting I may be missing.