I clicked with the rigth button of mouse in one project.
Then I clicked in the menu: Compare with --> Head Revision
(using git)
Then I clicked in Remember my decision
to always open team synchronizing
perspective.
But I dont want to alwas open team synchronizing perspective.
How can I undo this action?
I think you are after the following preference:
To access, Window | Preferences | Team
and change the Open the associated perspective when a synchronize operation completes
setting to the desired value.