Realm Owner can't change permissions of members because the "crown-button" is missing

So my friend bought a Realm on via the Switch and tried to set members to "visitor". This could not be done through the normal menu, so instead he downloaded the world and changed it in his singleplayer world. When he uploaded this changed world to the Realm, us members weren't able to build/hit anymore, so setting members to visitor had worked! Only problem now is the following: There is no way to change members from visitor to normal, even when given mod. This was once done by clicking the crown-button beside a player in the menu, but since this button has appeared, there is no way to change the status/permissions of a member from visitor to anything else. I believe this is bug and not intended?