First of all, it could be that Windows simply set itself as default boot, and this could be checked from your live USB entering in a terminal efibootmgr. You should see the Windows entry as first, and then the Garuda one. The order can be changed with e.g.
sudo efibootmgr -o 0002,2001,2002,2003,0000
The sequence you can take from the first efibootmgr check and change as needed.
If Garuda is not shown at all, you'll have to reinstall the bootloader and update the grub.
To do that, you could follow this guide:
https://forum.garudalinux.org/t/how-to-chroot-garuda-linux/4004