This feature is available in Enterprise and Ultimate editions.
Team capacity details don't automatically display by default; you must enable/configure them by setting the target velocity for each team. The Target Velocity field is located in the Team details view and allows teams to record their typical velocity using their own recent history as a guide.
Select Admin > Member Admin > Teams.
Click the Edit button next to a team to open the details view or create a new team.
Enter the project details as appropriate, enter the Target Velocity, and then click Save.
Note that after you enter the team's target velocity, the system automatically calculates the team's release capacity based on the duration of the release.