To select entities using the selection buttons

From the Entity Attributes panel:
  • Click All to select every entity in the list-tree.
Or
  • Click None to deselect all highlighted entities in the list-tree.
Or
  • Click Flip to exchange the currently selected entities for the unselected entities in the list-tree.
Or
  • Click Displayed to select the entities in the list-tree that are currently displayed in the active window.