Where to put the UMG?

In the tutorial I did put the UMG handling into the GameMode C++ class.
Now I read, that the GameMode is server side only.

So, where do I put the UMG C++ stuff? Into the Player? (APawn,…?)

I put the display logic into the widgets and the control logic i the player controller (which si clientside only as well)

Are you sure you did not misread? As far as Im aware, the GameMode is replicated…

Anyway, there is also the GameState object…