To turn Joins off in Roblox, go to Settings > Privacy > Visibility & private servers > Visibility, then set your current experience/join setting to No one so other people can’t join you from your profile or activity.

Quick steps

  1. Open Roblox and log in.
  1. Go to More or the gear icon, then Settings.
  1. Open Privacy or Privacy and content restrictions.
  1. Find Visibility & private servers.
  1. Change the setting so your current experience is visible to No one.

What this does

  • It stops people from joining your game session through your profile/activity.
  • It’s a privacy setting, not a ban or account restriction.

If you meant something else

If you meant cutting joints off in Roblox Studio for building or scripting, that’s different: Roblox uses tools like BreakJoints() for breaking connections in code, and modeling tools like Negate/Union for cutting parts.

TL;DR: In Roblox, turn joins off by going to privacy/visibility settings and setting your current experience to No one.