Thanks for your reports everyone! After discussing this with our team, there’s been some UI scaling changes which are intended and can cause the blurriness in-game. The game now renders the UI as the same resolution as the game and will no longer use render scale. This results in some fuzzier graphics for some users.
Allyriae hit this on the nail. This should help with the fuzzy graphics! Please check out their post here 
To explain this a bit further, some systems will be looking to set the resolution closest to 720p, 1080p, and 1440p, instead of using the render scale.
For example, on a 4K laptop, it’d be 3840x2160 at 50% render scale, now it should be 1920x1080p at 100% render scale. Adjusting these settings for the resolution drop and and render scale slider, should get it similar to how it was before the 8.3 patch. Hopefully, this helps with some of the FPS drops as well!