You can delete each group that is currently shown on the canvas.
CAUTION: When you delete a group, all blocks and wires within this group are also deleted.
To delete a group
On the canvas of the model editor, click the group that you want to delete (it does not matter whether it is currently collapsed or expanded) and press Del.
To delete a group
On the canvas of the model editor, click the group that you want to delete (it does not matter whether it is currently collapsed or expanded) and press Del.