You can access the submaster list by pressing [Sub] [Sub], [Tab] [1][5] or through the browser (Record Target Lists>Submaster List>[Select]). Either of these commands will open a new tab for the submaster list or if it is already open on a tab, will bring focus to the list.
The list view includes a list of all submasters including their labels and all properties. You can navigate within the list by using the [Next] and [Last] buttons or by selecting the desired submaster from the command line.