Being the intelligent piece of software program it’s, when UE4 is inactive for a specific amount of time- or extra particularly if the body fee of the editor has been beneath a sure threshold for a sure period of time (should you’ve been enhancing the open degree, blueprints or code versus operating your sport within the editor for instance) it robotically lowers the visible high quality of what’s displayed within the editor to save lots of on CPU processing energy. Note that this characteristic doesn’t impact UI components akin to buttons and textual content and the like. Your editor may seem like this straight off the bat, if you’re loading a challenge that you’ve had open beforehand, the place the body fee of the editor was beneath the set threshold for an prolonged interval, previous to you closing the editor.

Generally it should show a pop up briefly first supplying you with the chance to cancel the change, however should you ignored it or did not see it (should you had switched out to your browser briefly maybe or went and made your self a sandwich) then the modifications will probably be utilized. Out of curiosity which model of UE4 are you operating?

I”m operating 4.14 and it robotically reverts the decision and different high quality settings to regular as quickly as I click on on an object throughout the editor, nonetheless it might not revert robotically on earlier variations, I’m unsure. In any occasion you possibly can change it again manually by adjusting the Scalability settings- simply click on on the ‘Settings’ drop down above the editor, and choose ‘Scalability Settings’. You may change the standard of the supplies displayed within the editor and the preview rendering degree with the 2 settings instantly beneath if they’re set decrease than anticipated, however the scalability settings is often the perpetrator.

I’ve included a hyperlink to Epics documentation on Scalability Settings so as to learn extra about this characteristic, and make knowledgeable selections in regards to the settings you regulate versus taking a shot at nighttime, nonetheless if you have not already attempt clicking just a few objects inside your degree first, or maybe simulating play mode to see if the settings revert robotically.

Note additionally which you could flip off this characteristic within the dialogue field that pops up sooner or later, or by unchecking the ‘Monitor Engine Performance’ within the scalability settings menu, although now that you understand how and why it occurs (assuming this submit resolved your situation), it is in all probability higher to not because it’s fairly rattling nifty for my part. I hope that helps!