For Windows users this relates to the new HiDIP display support.
In sizes up to 175% ArtRage Vitae uses a 1:1 scaling of the UI. For larger Windows display scaling ArtRage Vitae switches to a 2x scale for the UI.
You can turn off the ArtRage Vitae HiDPI support from the ArtRage preferences.
From the ArtRage ‘Edit’ menu, select ‘ArtRage Preferences’
In the ‘Interface’ section of the panel you’ll see a ‘Retina and HiDPI screen support’ option. You can turn that off and restart ArtRage.
ArtRage’s interface should scale up to match the display scaling.

Another solution is to increase your Windows Desktop display value a smidgen higher to 175%
ArtRage will switch to the 2x UI resolution.