A great new enhancement to Inventor 2020 is the ability to add “End Caps” to your frames.
The “Insert End Caps” command is part of the sleek new panel UI.
There are options for the end plates to have either sharp, filleted or chamfered corners, and these caps can be flush, inset, or offset, making them match most manufacturers needs.
The animated GIF below shows the tool in action:
And Finally, here is the official Autodesk Frame Generator video for 2020.