How do I create app folders in the GNOME application menu?

I. Native GNOME Method:

(GNOME <= v. 3.32)

1. Run Ubuntu/GNOME Software

2. Go to Installed tab and click in right-top corner button with "tick" icon :

3. Select application to group in folder.

4. Click in left-bottom corner button Add to Folder... :

5. Type name of new folder...

II. Not Native, But Most Comfortable Method:

(need additional software, Ubintu <= v. 20.x, GNOME <= v. 3.32)

I recommend to use Appfolders Management extension by Maestroschan If You not familiar with GNOME extension, just follow link above and simple instructions. (You will need install recommended special browser Extension which help install this Gnome extension).

Use right mouse click on app and folder icons to get this options:

You can do this using a GNOME shell extension called "Appfolders Management extension".

It's

An easy way to manage "appfolders" (folders in the applications view) directly from the applications view.

Right click on an app icon and you'll get the options:

Alternatively you may use an application called GNOME App Folders Manager for the same purpose.

Ubuntu 19.10 and later

You can do what you do on your phone and just drag an app icon and hover over another one until it creates a folder. Then you can right-click that folder and rename it.