The Tab groups feature opens a docked window showing a tree view of the various tab groups. It is possible to select multiple tabs at once by Shift-clicking or all of them with the Ctrl+A shortcut. Right-clicking on one or more tabs shows more options.
The other tab groups will only appear if a session that is part of a tab group (other than the All tab) is active. 
Although it is docked by default, the Tab groups pane can be windowed, dragged, and docked anywhere within Remote Desktop Manager.
To learn how to create a tab group, refer to Tab group bar.
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