switch between forward / deferred rendering (temporarily)
If you switch it back it won’t start compilation again.
Engine generally warns you about this stuff:
I’m not sure why many people here having issues with compilation of shaders. It is a lot of shaders, but it rarely takes more than a hour to compile. Even 30000 shaders. PCIe SSD + 16-32 threads CPU is a must for non mobile Unreal project.
Also disable all the options that increasing the number of permutations. Especially stuff like Quixel Master Materials.