NOTE: after you turn the LAN ports to paid ports, you won’t be able to access the router’s admin page, only if you log in to the hotspot first.
Related article: How can we use our own internet without paying?
Go to Services > Hotspot > Hotspot System > Separate WiFi from The Lan Bridge > DISABLE (then press Apply Settings)
Turn off DHCP server: Setup > Basic setup > Network Address Server Settings (DHCP) > DISABLE (then Save)
NOTE: If you are using virtual SSIDs in your setup, those will also be set to go through the hotspot authentication by setting the LAN ports to paid ports. Also, you have to renew your IP or reboot your computer to see the changes.