The Template Editor allows you to edit multiple documents at the same time with tab groups.
To create a tab group, select New Horizontal Tab Group or New Vertical Tab Group from the Window menu. Alternatively, click and hold the mouse cursor on an existing tab at the top of an open document window, and drag the tab down into the code-editing area. When you drop the tab, the shortcut menu will offer you the choice of creating a new vertical tab group or a new horizontal tab group. In any case, the active tab when you perform the operation will become the first tab in the new tab group.
Vertical Tab Groups:
Horizontal Tab Groups:
You can move a tab from one tab group to another tab group by dragging and dropping the tab. You can also create additional tab groups by repeating the process that creating the initial tab group. However, all tab groups must be of the same type; you cannot mix horizontal and vertical tab groups. If you close or remove the last tab in a tab group, Template Editor will eliminate the tab group.