Reservation in Attribute Manager; Reserve All Attributes (Teamwork)

Click the Teamwork pop-up at the bottom of the dialog box and choose the Reserve command. Reserving Layers here is equivalent to reserving the Layer Settings dialog box.
Note: If the Teamwork pop-up is gray, it means you do not have the access right needed to delete or modify the attribute.
You also have the option to Reserve All Available Attribute types, from the same pop-up. This is equivalent to reserving all of the settings dialog boxes of all available attributes. Attributes you have reserved display a green control light on their respective tab pages in Attribute Manager, as well as in their respective Settings dialog boxes (e.g. Layer Settings).