assuming you have a UEFI setup;
not all firmware allow you to change bootloader order, in that case resort to changing bootloader-order using efibootmgr;
first type;
$ efibootmgr
BootCurrent: 0003
Timeout: 2 seconds
BootOrder: 0003,0002,2001
Boot0000* UEFI Onboard LAN IPv4
Boot0001* UEFI Onboard LAN IPv6
Boot0002* Windows Boot Manager
Boot0003* manjaroSSD
Boot2001* EFI USB Device
the current bootloader-order is given as; BootOrder: 0003,0002,2001
alter such that "Windows Boot Manager"comes first using;
sudo efibootmgr -o <new boot-order sequence>
ex: for the above case it would be
sudo efibootmgr -o 0002,0003,2001