If you want to play alone or without being disturbed by other players, here's how to appear offline in Roblox.

To unlink your account, go to the Settings > Roblox Account and click on the Unlink the account option. Now, when you open Roblox, you will be asked to sign in again.

Go to your child's Roblox account, click the gear icon, then choose Settings > Parental Controls > Add Parent Now type in your own email – the same one you yourself used to create a Roblox account ...