Hello, you post in two threads:

yes, that's possible. please check your easyblog backend -> settings -> layout -> dashboard
there you find an option called "Maximum tag allowed per post" where you can change it.

Unfotunatelly I am not able to find this at EB 5.0.31.
There is no backend -> settings -> layout -> dashboard (even not in german translation). I clicked all areas, no maximum tag setting