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To disable access point on router you can turn of WiFi by pressing the WiFi button, or by logging into the modem going to WiFi settings and disabling the radio for each WiFi bands.
Why do you want to disable the routers access point for Chromecast? You need a WiFi network for chromecast to work.
i got the following msg when trying to set up the cromecast : " Your Chromecast has been set up but can't be found, make sure your phone & chromecast are on the same wi-fi network." then the help centre suggests to disable access point on router