Some website's mobile version lacks the features of its desktop version.
If you want to access those features on mobile, then you need to request the desktop version of the site.
That's it. Now, you can see the desktop version of the site.
Visit Facebook by its desktop URL and then apply the above steps. Otherwise, the above steps won't work.
You can apply the above steps to get back the mobile version of the site (if you wish).
For Gmail desktop version, the steps vary from above. Here's how you can request the desktop version of Gmail on Android:
Go to Gmail and then sign in. Now, hit the Hamburger icon (three vertical lines) at the left corner of the screen.
Scroll down until you see "Desktop" link. Tap on it.
Now, you can see the "Basic HTML" view of your Gmail account.
If you want to look at the "Standard" view of your Gmail account, then you need to do these two steps:
Tap Overflow Menu (three vertical dots) at the top and then tap "Request desktop site" option.
Find and hit the "Standard" link at the bottom.
That's it. All done.
I hope that this post is useful to you. If it is, share this post with your friends.
How to Request Desktop Version on Android Device