If you already upgrade your Qlikview to 12.5 SR2, You mightr see the issue with font size in Windows 10.
In fact It's wired that this issue didn't exits in previous version. I think this issue is a kind of fundamental issue that is happening beacuse Qlikview is nor responsive as Qliksense. So every things in QLikview is fixed-size and it dosn't change when windows display setting or resolution change.
Any way to fix the issue I found two way:
Changing Windows display resolution (to 1280X720)
Changing windows font size to 100% and using Qlikview plug in zoom facility to enlarge the dashboard
I just upgraded to 12.5 and unfortunately this fix doesn't address the fundamental problem. My screen resolution was fine - now it looks like everything is in 3pt font! I tried your suggestion and although it works, my monitor resolution is compromised for all other apps.
Here is my new screen shot of my start page. The menu fonts are normal but my head hurts attempting to read the content.
The rendering engine for QlikView was updated from GDI+ to Skia in 12.30, so if you upgraded from a version prior to 12.30, this is what's likely causing the to be displayed the way you are seeing. From What's New in QlikView November 2018?
Implementation of Skia graphics library The Skia graphics library delivers greater flexibility with a plethora of 2D graphics. It replaces the GDI+ library, which is no longer supported by Microsoft. Skia graphics are made available via common APIs that work across a variety of hardware and software platforms to meet your graphical requirements, including text rendering, shapes, various path effects, shading, and more. Within the QlikView November 2018 Preview Release, you may notice rendering differences in QlikView Desktop and IE Plugin objects, as well as Ajax Client graphics.