If you've changed the functionality of an assignable button on the Control Center remote, you can reprogram it for another function whenever you'd like to.
First, press and KEYPAD button to access the Keymap.
Note: you can use your remote normally here and all remote and list items will "pass through" to the current device.
Short press the Keypad button again to enter customization mode.
Note: you will only be able to reassign button functionality for those functions listed in blue.
Press the desired button on the Control Center remote that is blue on-screen (it will turn white), and then select the new function you wish to replace it with from the list that shows to the right of the remote buttons.