Canon EOS RP Mirrorless Camera - Manual (Page 537)

537
Custom Function Settings
C.Fn III-5: Customize buttons
You can assign frequently used functions to buttons, such as <
V
> or <
p
>.
Different functions, for use when shooting still photos or movies, can be
assigned to the same button.
1
Select a part of the bar.
2
Select a function to assign.
z
Press <
0
> to set it.