Dualboot with Linux Mint and Win 10 Pro. How to stop Windows 10 from overriding my boot order in BIOS on every restart? - eviltoast

My PC (self built with Asus motherboard) was a Linux-only machine until I added a fresh install of Win10 on a separate drive using Ventoy. I use Linux Mint 95% of the time and want to automatically boot into Linux, preferably without showing GRUB. I have Fast Boot turned off, and I keep resetting the order in BIOS only to have the PC automatically boot right into Windows. How do I stop Win 10 from overrriding everything?