Setting OrbiPro Router : Disabling 2.4Hz, channel 140, bandwith 20Mhz

Orib uses 80 MHz channels on 5 GHz by default. No setting to change this.

You might be able to set separate SSIDs by following this thread.  Don't know if it works for the Orbi Pro.

https://community.netgear.com/t5/Orbi/How-to-set-a-separate-SSID-for-the-5-GHz-network-on-your-Orbi/td-p/1396594

Channel 140 is a DFS channel, on a frequency shared by radar.  Access Points must monitor for radar and use another channel if radar is detected.  This can cause service disruption.  None of the NETGEAR routers I own support using DFS channels.  Also, some client devices don't support DFS channels.

You are probably better off with a different router.  Also, the channel selection might not be a good choice.

The Unifi access points from Ubiquiti support your requirements.  They require a separate router and a host to run the WiFi controller software (at least at setup time).