To set up a second desktop on your Android phone, you first need to make sure that your phone supports multiple desktops. If yes, long press the blank area of the desktop, the option to add a desktop will appear, click to create a new desktop.
On the new desktop, you can long press the app icon and drag it to the desired location, or you can add the app you want from the app menu.
In the new desktop, you can also change the wallpaper, add widgets, and so on to customize the look of the desktop.
If you want to delete the desktop, press and hold the blank space on the desktop to find the Delete option. I hope my answer is helpful to you.