Hi there, I have been playing Lords Mobile for the past three years.
I have a question, in LM you can build multiple number of similar buildings like barracks and hospitals. However I cannot seem to find how to do that in Mobile Royale?
I want to build more hospitals, can I do it, if yes, where should I click? Thanks a bunch.

You cannot build more hospitals in mobile royale. There is only 1 of each building type, including farm, quarry etc. 

To increase your infirmary capacity you can change diplomacy tech, click here to see guide about diplomacy.