There are a few alternative ways to view the all pending friend requests together in list. Out of them, I found the easiest way to use an Facebook app called “FriendRequests“. The location of this app is at apps.facebook.com/friendrequests . Once you allow this app to work with your profile, you can see all the friend requests you made before and forward those were not confirmed. See the screenshot of it on my account.
If you want to remove, undo or cancel friend request from someone , then click on his name. Then in his profile window you will see a cross mark beside the line “Awaiting friend request”. Click on the cross mark to cancel the request.