The
command converts the layer masks of the selected layers into a selection, which replaces the selection that is already active in the image.White areas of the layer mask are selected, black areas are not selected, and gray areas are converted into feathered selections. The layer mask itself is not modified by this command.
You can access this command
From the main menu through
→ → .From the Layers Dialog, you can access it through the command of its context menu.