Hello, I’ll attempt to reproduce this shortly. In the meantime, are you sure that this was broken in 4.19.0 and not broken in 4.19.1, or 4.19.2? I assume that you have been on 4.18 until this point?
While it isn’t a suitable fix, you should be able to continue work by working around this by using a 1080p resolution if you need an immediate solution.
Have you tried enabling/disabling the High DPI settings in Editor Preferences? They are “Enable High DPI Support” and “Disable DPI Based Editor Viewport Scaling”. These settings have unexpected results at times. Issues such as this are also usually linked to the scaling options in Windows, so I would suggest attempting to disable that (by setting it to 100% scaling) as well.