Change card order or unstack cards

1. In Card view, tap and hold the card you want to move. This can be a single card or a card in a stack.
2. When the card turns slightly transparent, drag it to another position. You can drag a stacked card to another position in the stack, or drag it out of the stack to unstack it.

This needs Enable stacked cards, which is on unless you turned it off in Tweaks.