Really bad graphics & landscape dissapearing

So i’m just getting started using UE4, so i was building a level today, and all of the sudden the quality changes drastically, also the landscape i drew + the standard landscape that’s already in the level dissapeared.
In addition, some of the moveable blocks turned static.

Im not a 100% sure but i think i pushed the “insert” button when it happened.
I haven’t really found a solution to this problem online yet.

My Engine Scalability Options are all put on Epic, i’m running on a i7 4790k@4ghz , a Gtx 970 and 16gb RAM

Here’s a picture of what i mean:

Hope someone has got a solution for that, thanks allready.

It looks like you have the settings of “Engine scalability” too low. Click the Settings button in the toolbar, then go to Scalability Settings Engine and change them all to the “Epic” quality.

Thanks for the Reply, but as i mentioned before they’re allready on Epic.