I tried turning on Enable High DPI Support, but after the restart it automatically disabled it again. DirectX 11 didn’t fix it either, the only solution for me was putting the project on an SSD drive. This really sucks, as hard drive space is at a premium with Unreal projects, and the SSD drives are still very expensive. I had no problems with 5.1.1 using this drive, so to suddenly have to switch is a major pain. Wish they’d fix this.
I take it back, putting it on the SSD drive initially appeared to fix it, but didn’t, neither did disabling the Studio Telemetry, UDP or TCP plugins.