The Looper page is a special perform page that is dedicated to the most useful Looper transport parameters. These footswitches cannot be remapped.
The normal perform parameters page allows you to remap the footswitches, but you can only assign P/A/B parameters to the respective P/A/B footswitches.
Press and hold any of the LED buttons (P/A/B) and this will open the Performance Parameter Mapping menu.
Use Quick Knob 1 to select a parameter (example: Record) and use Quick Knob 2 to select a control source (example: CC1)
Now, CC1 will toggle the record function.