How can you lock a layer in AutoCAD?

To lock a layer in AutoCAD, selecting the layer in the Layer Properties Manager and clicking the lock icon is the correct method. This action ensures that all elements on that particular layer cannot be edited or modified until the layer is unlocked. Locking layers is a crucial feature that helps prevent accidental changes to specific drawings or elements, especially in complex projects where multiple layers are used.

The Layer Properties Manager is the primary interface for managing layers, providing an intuitive visual representation of all available layers along with their properties. Clicking the lock icon is a straightforward and effective way to quickly lock or unlock layers as needed.

Other methods mentioned may not be as commonly implemented or might not achieve the intended locking functionality in AutoCAD. For example, using the command line might not be the easiest method for all users, and the right-click context menu may not always be available depending on the interface settings. Additionally, double-clicking the layer name does not provide a locking function, thus not contributing to the layer management process effectively.