I've got a new laptop that came with a 4k UHD screen. The GUI on QGIS doesn't scale well making most of the menu elements too small to easily see.
Is there a way to change the scale of the gui?
As @Dave Pitman points out in his answer, that a user, Stu Smith, got the manifest hack to work.
I actually got it to work too. Follow the instructions using the link:
Once the manifest.txt file is downloaded, copy it to the QGIS bin folder. In my case:
C:\Program Files\QGIS 2.18\bin
and rename it to 'qgis-bin.exe.manifest'.
Additionally, you'll need to ensure display scaling is disabled.
To do this, you'll need a shortcut to 'QGIS Desktop', for example, by pinning it to the Windows taskbar.
Right click the QGIS icon, then right click 'QGIS Desktop 2.18.3' in my case, and select 'Properties'.
Click the 'Compatibility' tab, and uncheck 'Disable display scaling on high DPI settings'.
There's a minor niggle that the text and icons are not as sharp as they would be otherwise, apart from that the hack works pretty well.
Update: For the Windows 10 Creators update, in the 'Compatibility' tab, check 'Override high DPI scaling behaviour. Scaling performed by:', and then select 'System' from the drop-down menu.
Go to Settings >>> Options >> General Menu > Icon Size Check this below: http://docs.qgis.org/2.2/en/docs/user_manual/introduction/qgis_configuration.html
I've tried all of the scaling remedies I could find and so far, QGIS is not workable on an UHD Windows 10.
For other applications with similar issues, the "manifest" hack has worked pretty well.
This is working acceptably. The manifest file must be spelled perfectly 'qgis-bin.exe.manifest'.