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you will need to use console commands to give yourself an "empty room facility " in that slot. It's been that long since I did any xcom2 work though I have no idea what the commands are anymore... should be able to find them with google, maybe.. good luck :)
There are some other mods out there that allow swapping Engineers to Scientists like Core Room Slots ....but there are few mods with actual new facilities that utilise a hybrid setup. In fact, there's this mod and Psionics Ex Machina... and that's it, to my knowledge ...
I was confused for a bit why I wasn't able to make the Spider Suits, EXO Suits, etc. in the Proving Grounds anymore.
Turns out I missed a part in the mod description about how the default config makes these exclusive to the workshop. So in case anyone runs into this, that's the reason. :)