In the settings panel, there are a number of features you may not want curious people to be poking around with. That is why you can set a password to lock the Settings panel, and we suggest using it.
Click the Settings cog in the top right of the screen.
Then click the 'Set Password' button:
Follow the prompts to set your new password.
If you decide later on that you no longer want a password to project the Settings panel, you can disable it again with the 'Disable Password' button: