You can use the View Filter to control the selectability of landscaping elements or any elements associated with the terrain.
To make elements on the terrain selectable or non-selectable:
Select View
> View Filter or click the View Filter button on the Basic View
Control or Advanced View Control toolbar.
In the View Filter dialog, select the Elements on Terrain tab.
Click the filter icons in the Selection column to toggle selectability on or off.
Element is selectable
Element is not selectable
If you want to make all landscape elements selectable, click the Select All button. If you want to make all landscape elements non-selectable, click Select None.
Click OK.
Note: The selectability of exterior lighting, exterior furniture or exterior accessories that were inserted using the “Insert on Location” option is controlled on the Elements on Location tab.