Hi @KwameShark,
Welcome to the EE Community
The in app Wi-Fi controls are only for those on EE Fibre Broadband. For 5G mobile broadband you can access your router settings by visiting the admin page at http://192.168.1.1 on your browser. The login details will be on the keep me card with the router and also printed on the bottom of the router.
In terms of checking what speed you are getting you could check using a speed test service such as Speedtest by Ookla - The Global Broadband Speed Test or Internet Speed Test | Fast.com
Alex
