Symbol: 
Function: The command groups the selected visualization elements and displays them as one.
Call: Menu “Visualization”, context menu
Requirement: At least 2 elements are selected.
To select more elements you can drag a window around the desired elements with the mouse. Alternatively you can click on the desired elements while keeping the [Shift] key pressed.
To select all elements you can open the context menu of the visualization editor and choose the “Select All” command.
You can also drag and drop elements to a group. For that, press the [Shift] key while dragging the element to the group. Meanwhile the cursor changes its appearance (display a small plus sign).