This pane has a small toolbar to facilitate various common actions. These tools are described (from left to right):
Expand: Expands all object type sections that were contracted.
Contract: Contracts all expanded object type sections in the pane.
Select 2D: Enables the visibility of all 2D marked items on photos.
Deselect 2D: Disables the visibility of all 2D marked items on photos.
Select 3D: Enables the visibility of all 3D (projected) items on photos.
Deselect 3D: Disables the visibility of all 3D (projected) items on photos.