You can save up to three party setups
The character you place on the left takes the most attacks, so put a character with high DEF there.
You can sort and filter your characters. Level and Rarity can be switched between ascending and descending order.
Press and hold an icon to open the character detail screen.
Tap an icon, then tap a party slot at the top of the screen to add that character.
Changing a placement works the same way.
Tapping a selected icon again clears the selection.