The Search and Explore option lets you to search OKRs owned by other Users and export them in excel.
To find Users 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 Users button as shown in the pic below:
From Users page you can enter names of the users to overview their OKRs, to go back to My OKRs page click on back to my OKRs button above Users name as shown below. You can also see OKRs of Teams, People you are following and Direct Reports from the same page.
Enter a different period to view and export OKRs of the same user.