Hello,
I would like to disable this button:
Is there a possibility to hide this option, so users cannot list all members of the team?
We want to use the team to communicate with our clients, so ideally we would like to isolate them.
Hi Šimon, welcome to the Mattermost Community! 
While there’s no built-in way to directly hide the “View Members” option, you can explore our advanced permissions guide for help restricting visibility of team members for specific roles. Let us know if you need further guidance!