Selection Menu
Use this menu to choose which types of object can be selected in the viewport (by default, all object types are selectable).
Enable an option to enable selection for that object type, or disable the option to prevent selection.
These options are especially useful when you are working with large projects. Suppose there are dozens of lights, cameras, bones, polygon objects and splines in the scene and currently you’re working on the polygon objects. To make it easier to select the polygon objects in the viewport, disable all options on the Selection Filter menu apart from Polygon. Then you’ll be able to select polygon objects only in the viewport.
The names of any Selection objects you have set up will also appear in this menu. Select the name of a Selection object to quickly select that entire group of objects.
Selection Filter
Main selection tools
Loop Selection
Ring Selection
Outline Selection
Fill Selection
Convert Selection
Path Selection
Select All
Deselect All
Phong Break Selection
Invert
Select Connected
Grow Selection
Shrink Selection
Hide Selected
Hide Unselected
Unhide All
Invert Visibility
Set Selection
Set Vertex Weight