See How to Cancel Pending Request

See How to Cancel Pending Request: If the other person hasn't accepted or denied the request, you can still cancel it. Foe whatever reasons you wold want to cancel your pending Facebook request, just note that how you go about canceling a friend request is a little bit different, depending on whether you're using Facebook in your Web browser or in the official Facebook app on your mobile device.

How to Cancel Pending Request

To cancel a pending friend request in a Web browser.

1. Click the "Friend Request" icon located at the top of any Facebook page. 
2. Select "Find Friends" and then click "View Sent Requests" to display a list of recent friend requests. 
3. Hover your mouse over the "Friend Request Sent" link located beside the pending request you want to cancel  
4. Select "Cancel Request."

Canceling a Pending Request in the Facebook App on Mobile Devices:

To cancel a pending friend request in the Facebook app on an Android or iOS device, 

1. You should start by tapping the "More" icon. The More icon is identified by three horizontal lines. 
2. Tap the "Find Friends" link in the Apps section and then tap "Requests." 
3. Tap the down-facing arrow located next to Friend Requests and select "View Sent Requests." 
4. Lastly, tap "Undo" next to the pending request you want to cancel.

That's all and you would cancel a pending request.

You may want to reduce the number of your friend request on Facebook. You can completely turn off friend requests in your settings, but there is another method that drastically reduces your number of friend requests, that is changing your friend request filter from 'Everyone' to 'Friends of Friends'.

How to Disable Friend Requests

On Mobile

• Open Facebook app in your app drawer and log in if you aren't logged in already.
• Tap ☰. It's either in the bottom-right corner of the screen (iPhone) or in the top-right corner of the screen (Android). 
• Scroll down then tap Settings. You'll find this option located towards the bottom of the menu. 
• Skip this step for Android. 
• Then tap Account Settings next. It's either at the top of a pop-up menu (iPhone) or toward the bottom of the ☰ menu (Android). 
• Tap Privacy. The tab is near the top of the screen. 
• Tap Who can send you friend requests?. This option is near the bottom of the screen. 
• Tap Friends of friends. It's the second option near the top of the page. This will prevent anyone isn't on any of your friends' friend lists from randomly adding you on Facebook. 

On Your Computer

• Go to Facebook's website with your browser and log in.
• Click ▼. It's in the top-right side of the Facebook window.
• Click Settings. This option is found near the bottom of the drop-down menu. 
• Click Privacy. It's a tab on the left side of the page. 
• Click Edit to the right of "Who can contact me?". This is about halfway down the page.
• Click Everyone. This box is below the "Who can send you friend requests?" heading. 
• Click Friends of friends. It's one of the options in the box's drop-down menu. Doing so will set your Facebook friend requests setting to "Friends of friends", which will prevent people not in your friend group from sending you friend requests.

Activating the friend requests from 'Friends of Friends' option as shown above. would to a large extent, cut down your number of friend requests on Facebook.