How does Samsung a8 set the shortcut keys pulled up below?

Samsung 9 158p phones have shortcut keys set at the bottom of the screen:

1. Under the standby page, select the application.

2. In the mobile phone application interface, click the menu button in the lower left corner.

3. In the pop-up menu, click Edit.

4. At this point, the icon will have a virtual box. Slide the screen left and right to find the icon that needs to be added to the bottom shortcut bar.

5. Click the icon and drag it to the bottom of the screen, and don't let go. (Take SMS as an example)

6. If you need to cancel the icon in the shortcut bar, please press and hold the icon to be deleted and the trash can icon will appear. Just move the icon to the trash can.