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How to make the built-in AP in desktop series available in Central?

Currently, the built-in AP in XGS107W is basically a waste resource: I cannot assign SSID to the built-in AP from Central.

Is it doable? Or it's not possible by design?

If not possible from Central, can I make the built-in AP just like a regular APX AP? Such that at least I can broadcast an SSID from all APX APs and XGS's built-in AP.

Thanks!