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MULTIPLEX receiver for SRXL signal output

can anyone help me configure a MULTIPLEX receiver for SRXL signal output? I’m following the instructions presented in https://ardupilot.org/copter/docs/common-srxl-receivers.html#how-to-configure-a-multiplex-receiver-for-srxl-signal-output but the RX options window doesn’t open and only shows a SMART ID Settings windows. Is it normal?

I’m trying to configure on a RX-4/9 FLEXX M-LINK.

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