You can save the current sizes and positions of panels and any menu changes as a custom workspace. The names of workspaces appear in a Workspace submenu of the Window menu. You can edit the list of names by adding or deleting a workspace.
To save the current workspace, choose Window > Workspace > Save Workspace. Type a name for the new workspace, indicate whether you want to include panel locations and customized menus as part of the saved workspace, and click OK.
To display a custom workspace, choose it from the Window > Workspace submenu.
To delete a custom workspace, choose Window > Workspace > Delete Workspace. Select a workspace to delete and click Delete.
For a video on customizing the workspace, see www.adobe.com/go/vid0065.