terminator

The Terminal 'terminator` allows working simultaneous with mutliple terminals
Doc: https://terminator-gtk2.readthedocs.io/en/
Alternatives for power users: tmux with a nice config or zellij
Tipps
Select a all sessions in one tab of the terminal:
Open a second 'tab' on the window by pressing 
Ctrl Shift t.
Switch back to the first (intial) tab.
Press 
Super t.
Set the group of all selected Terminals
Press 
Shift Super and click on the small three boxes in the top left border - type in the new group name