Available in Inventor 2016 R3 - Subscription customers
By default, Connected Design on A360 functionality is loaded and visible at the bottom of the graphics window in Inventor 2016 R3.

On the ribbon View tab, Windows panel, in the User Interface drop-down list, select, or clear the check box for Connected Design on A360.

Unloading the
Connected Design on A360 add-in removes the Design Share button
from the graphics window.
In the Add-in Manager dialog box, double-click the name Connected Design on A360 in the list to switch between Loaded and Unloaded, or between Startup/Loaded and Startup/Unloaded.