Selector Tool - Edit Handles Button
This button on the Selector Tool Infobar enables and disables edit handles. With edit handles displayed you can use the Selector Tool to edit objects.
The Selector Tool offers the ability to do basic object editing but the more specialized Tools often offer more. For instance the QuickShape Tool can bend the edges of a QuickShape whereas the Selector Tool can only perform simple QuickShape editing.
Tip
You can swap the setting of this control using the 2 key on the main keyboard.