When I play my level in the editor the image is getting a aliasing. In any template this is happening.
How do I fix this?
Image in attachment.
Make sure that you use the “epic” quality settings -> settings - quality - epic 
Where I found this option?
Project Settings?
You can find it in the top bar over the play viewport -> beside the marketplace button
I was blind! Thanks moderator!
This fixes my problem. 