Questions about Lenovo Tab M8 FHD

No, there is no option for this in the settings.

Unfortunately, this product is only available in the colour below (grey).

Yes, even GLONASS and BeiDou. https://www.gsmarena.com/lenovo_tab_m8_(fhd)-9826.php I can't confirm the details, but it navigates perfectly. Tried it out myself.