Thank you
And this is already some oudated content 
But after this is got this problem what prevents me from continueing
Yes i did change it to scalable indeed
And for the rendering setting i only habe the riquierd settings enabled for lumen to work
And o dont get it because everything was fine at the point of this video
I started on greyboxing a small extention to this map even startee using level streaming to lift some strain of the GPU
So the main building is one level
Then a level for the assets in this area seen on the previews
And a level for the extention
Added some navmesh blocking volumes so the AI didnt spawn on the oudsite of this map because of some floors being out of the level play area
And this is were the issues started
At this point im 3 weeks in trying to fix this at the point starting to lose hope
Also hope you had a great new year😉