The Search and Explore OKRs lets you to search OKRs owned by other Teams and export them in excel.
To find Teams go to Search and Explore OKRs:
Click the arrow button of Search and Explore , which is placed to left side of selected period.
You can click Teams button as shown in the pic below:
From Teams page you can enter names of the Teams to overview their OKRs, to go back to My OKRs page click on back to my OKRs button above Teams name as shown below. You can also see OKRs of your Team(s).
Enter a different period to view and export OKRs of the same Team.