At any time, you can select all objects in a logical group.
Select all objects in the logical group by Shift+click
While no other object is selected, hold Shift and then click any object in the presumed logical group. If the object is part of a logical group, all objects will be selected.
If only one object is selected, it means it is not part of a logical group, or the group consists only of one object.
Select all objects in the logical group by right-click
While one or more objects belonging to the same presumed logical group are selected, right-click, point to Logical Groups, and then click Select Group. If the object is part of a logical group, all objects will be selected.
If only one object is selected, it means it is not part of a logical group, or the group consists only of one object.
Note
The feature is available only in the version 2.1 and newer, and only if you did not disable manual logical groups.