SAMD21 PB22 PB23 free boot modification

Hello everyone, i'm struggling with these pin to remove the nominal serial port function on bootloader configuration. I would like the bootloader doesn't use them as serial peripheral so it can't control them during boot. I'm using Zero bootloader and i need help to modify it.
The sercom on these pins is sercom5 but i can't find where to modify in the code.

Please help me.
Thanks

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