Pitch limit for landing

hi
I want the pitch to be higher than -20 when the drone lands, for example up to -30 because the landing site is in a pit.
Thank you for telling me the location of the code that is stored in the source -20
I even set the minimum PITCH limit parameter to -30, but it didn’t go further than -20
If you tell me exactly in which file of the source code this PITCH limit is placed, I can re-create the firmware and install it on Pixhawk.