•Merge in current window will preserve your open documents while applying other properties of the selected workspace.

•Replace in current window will close your open documents and apply the selected workspace.

•Add to current window will add the properties of the selected workspace, so if you already have Pages tab displayed, and the Pages tab exists also in the saved workspace, it will be duplicated - you will end up with two Pages tabs.

•Create in new window runs a new instance of GN4 application and applies the selected workspace properties.