The most basic method of selecting Actors is simply to Left-click
on them in the viewport. Clicking on an Actor will deselect any currently selected Actors and select the new one instead. If you hold down the Ctrl
key while you click on a new (unselected) Actor, the new Actor is added to the selection. If you hold down the Ctrl
key while clicking on a selected Actor, the Actor is removed from the selection.
This method is good for selecting small numbers of Actors or several isolated Actors spread out across the map, but it can be slow and tedious for selecting large numbers of Actors.
When you select multiple Actors, you can then move them as a group, and you can modify their properties simultaneously in the Details panel.
When you have two or more Actors selected, you can add them to a group for easier selection and manipulation. For more information about grouping Actors, see Grouping Actors.