The Locker tool allows you to lock any object in space so that you, or someone joining your session, doesn't mess it up by mistake. The lock affects objects for all users in space.
You can switch between two modes using Stick or buttons in the submenu of the tool.
To lock an object, click on Locker icon in the menu and then dip the tip of it into an object you want to freeze and press the trigger. The object will turn light grey and will no longer respond on touch and press. To unlock, swith the mode and press on the object again with Locker.
To quickly lock or unlock all objects at once, use the special buttons in the menu.