Where is the resident service of vivonex3?

Enter mobile phone settings--desktop, lock screen and wallpaper--desktop settings--(other settings)--turn on smart desktop/minus one screen, return to the desktop and swipe to the leftmost page to view the permanent Service, the maximum number of cards that can be added to the smart desktop resident service is 20. If 20 cards are reached and you click to add a card again, a prompt message "Add up to 20 cards" will pop up.