same problem here, i searched most of the config files, but didn’t find anything. however, if you go to project settings → supported platforms and uncheck all (not android), it could work.
Or under project settings → platforms → windows/linux uncheck every “targeted RHIs”.
For me, those settings do not work. they removed shader model 5 as a default, but shader model 4 will be the new default, and i dont know why, since no supported platform uses this.
I would love to see a “default preview shader model” thing! 