The BSSID details are found on an access point details page (Wireless > Monitor > Access points page, then select an access point from the page to view its details), in the "SSIDs" section on the left.
It is expected that all bands will show as enabled and broadcasting on the page if at least one band is broadcasting on the AP for a given SSID: https://documentation.meraki.com/MR/Monitoring_and_Reporting/Access_Point_Status_Page
The BSSID details page does not reflect if the actual radio is enabled or not, as configured on the Wireless > Configure > Radio settings page. I would recommend using the "Give your feedback" button on the bottom right corner of the Dashboard page to request that a column be added to the BSSID details page that does accurately reflect the Radio settings page.
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