I doubt the gfx or cpu in this build can handle any scene from the lateat trash they pump out claiming to be a working engine.
You have to understand the Epic mentality:
Get an I999 processor (that doesn’t exist) and a RTX9999 TI Super Pro (which also doesn’t exist) or GTFO.
This is particularly true when working, since with 8GB of vram you can barely get the engine running and loading the textures it needs 
As a solution, turn on scalability settings, turn them down I would say to medium or even probably less.
You can probably work the editor then, even though you’ll never get to see what the product looks like at its “best” (which is arguable anyway since epic seems to like to tell people to eff off and get a better gfx even when the last one has just released 
)