HELP! I can not find FLOW_TYPE parameter on Flywoo F745 AIO board

I am using Flywoo F745 AIO and MATEKSYS 3901-L0X. The firmware version is ArduCopter 4.3.0-dev.
The connection is working fine, but I cannot find FLOW_TYPE, the parameter that sets the optical flow.
I don’t think optical flow is limited by the functional limitations of the 1MB board, why is this?
BTW the rangefinder on this board seems to work fine.

Well maybe it is. Do a build using the Custom Firmware Builder and find out.

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