This whole print area can be probed with a probe at the nozzle X/Y position (strain gauge).
There are mechanical limits that can’t exceeded.
Let’s pick the data:
Bed size (from stepper_x/y): 235 x 209
Probe position: (from bltouch): 40, 7 so the probe is (from top) 40 mm right and 7 mm top of the nozzle)
Bed mesh is (from bed_mesh): 10,10 to 230,220
Bed mesh should be : 10 + 30,10 to 235,209 - 7
. : 50,10 to 195,202
To get this working, turn KAMP off. (BTW: You do not need KAMP on Klipper 0.12.0: Bed Mesh - Klipper documentation)
More on borders an limits here.