Which Pro version are you using? And which is your license model?
If you have a creator license, on 2018.3 you should see much more options under the More... And Odata is down there on the first column of options (BTW windows will have more options than the MAC version, but Odata is in both):
I would recommend downloading the latest option (or the latest that matches your org server if you have one) and install it again.
I hope this helps
I didn't know about the OEM option. Maybe it does have restrictions on which data sources area available.
There isn't much we can do if that's the case.