If there is only one tab group, create a new tab group via the method shown in step 2 below.
To create a new tab group, drag a tab towards the right border of a tab group. A guideline is displayed at the position to which a tab is to be moved. When the tab is dropped over the guideline, a new tab group is created, which includis the selected tab.
Note You can create a new tab group by selecting [New Vertical Tab Group] in the [Window] menu.
If there are two or more tab groups, a tab can freely moved between tab groups by dragging and dropping the tab to the desired tab group.