To access a Portfolio's settings, select the hidden ellipsis menu to the right of the Portfolio's name. From this menu you can:
Rename Portfolio: Change the Portfolio name as well as make it public or private
New Portfolio: create a new Portfolio
Manage Members: Add/remove Members, change member role in a Portfolio
Privacy Settings: make the Portfolio public or private
Set Portfolio Color: Change the color of the Portfolio
Import Projects: Import Projects into this Portfolio
Download: Download a file of all Projects in this Portfolio
Archive Portfolio: Archive the current Portfolio
Delete Portfolio: Delete the current Portfolio
