You can edit the layout, i.e. how many and which icons are on the screen and how they are organised. Logically, screens are divided into "home screen" and the "others". You can individually set the layout for each of the categories independently.
In order to edit the layout, please login to your Walledo account from PC and navigate to Kiosk / POS tab, then click "Layout" button.
Select the grid type for home and others screens. Then drag-n-drop services in the order you would like them to appear on POS.
Important: changes will take affect after restart of the POS app.