Turn on front end (wp-admin) plugin/theme installation in staging?

I’ve noticed that in staging the option to install themes/plugins aren’t available from the wp-admin menu. Is there an easy way to turn this back on, or will it break stuff? I’m assuming this is a permissions thing?

Also, yes, I understand the blasphemy of asking this question in light of the philosophy here, so I apologize.

We’ll call this “end user problems”.