Step 1

Open the Facebook Messenger app on your phone and find the Settings icon in the bottom right corner. If you do not see Settings, click on Me instead.

Step 2

Tap on the People Section. You will see Message Requests. Tap on that section.

Step 3.

In this section, you will see any unread Message Requests. Below those requested there will be a blue link labeled “See filtered requests.” When you tap on this, you will be taken to the filtered request screen. If you have any filtered request they will all be listed here.

Step 4. 

If you want to remove these filtered messages you can do so by tapping Edit and then hitting Delete in the bottom-right.
Now, most of the messages hidden away here may be junk or messages from people you have never heard of. But there is a chance that a message or two may actually turn out to be relevant and important to you. So, make sure to check these hidden messages from time to time, just to make sure you aren’t missing anything too important.