3.5" LCD won't work with Fan Shim

If look at the fan shim circuit board, the round pad on the end opposite the one mounting hole is GPIO 17, physical pin 11.
If you look close you’ll see a circuit track / trace going out the bottom of that pad and then turning towards the switch. If you take an exacto knife and carefully cut that track so there is a thin gap in it. That pad will no longer be connected to the switch.
Like you’d do to change the i2c address on a breakout board.