Please write down or memorize every button what it's mapped to. Or you will suffer while binding later.
To make sure the key you map to has no bindings that you don't know by chance, you can map buttons to keys like "World_X". They are not bound by default.
After remapping, you can renter the mapping interface to check if the buttons are mapped correctly, the mapping will be shown at the top normally.
If you are going to place buttons like the layout shown in the picture
