How can I map the middle mouse button so it will reset the default view when clicked like it does in V4?
Looked under keyboard shortcuts but it doesn't accept the mouse click as a valid "key".
I believe the middle mouse button is now used for many of the 3D control schemes (Fusion 360, SolidWorks, etc). However, you can still use Ctrl+1 to return to the default view. Or you can customize that shortcut to any other key that you wish using the customizable shortcuts in V5.