Try to change it in Windows. There is an option in Advanced Systemkonfiguration. Got to System–> Advanced System Konfig. —> and there is the Option like Start and Recovery..( sorry in my Case i have it in German Language ). In the next Window ( top ) there is an Option like [ Systemstart ] and below the Standard OS! Take Windows 10 and Uncheck the other 2 Options Below. Hope this works.. but you need the Switch2Android Programm when u hide the Android OS.
I’m sorry for my Bad English, hope u guys can understand and it worked for u.
PS.: Do not Delete the Boot Entry in the BCD / Bootloader otherwise your Android wents Down 2 Africa or whatever .. đŸ˜‰