Change the stack order of layers and groups
Do one of the following:-
Drag the layer or group up or down in the Layers palette. Release the mouse button when the highlighted line appears where you want to place the layer or group.
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To move a layer into a group, drag a layer to the group folder
. If
the group is closed, the layer is placed at the bottom of the group.Note: If a group is expanded so that you can see all the layers within it, adding a layer beneath the expanded group automatically adds the layer to that group. To avoid this, collapse the group before adding the new layer. -
Select a layer or group, choose Layer > Arrange, and choose a command from the submenu. If the selected item is in a group, the command applies to the stacking order within the group. If the selected item is not in a group, the command applies to the stacking order within the Layers palette.
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To reverse the order of selected layers, choose Layer > Arrange > Reverse. These options appear dimmed if you do not have at least two layers selected.
Note: By definition, the background layer is always at the bottom of the stacking order. Therefore, the Send To Back command places the selected item directly above the background layer.