Manjaro Linux as distribution does not support secure boot so if you want to use secure boot for Windows - you will have to switch it off to boot Manjaro Linux installation - this quickly becomes an annoyance 
It is possible to use secure boot but it is a manual process and unsupported by Manjaro Linux as distribution.
The process is the same as it is for Arch Linux with the exception that kernels are named differently with Manjaro LInux - please see [Unified Extensible Firmware Interface/Secure Boot - ArchWiki] for more info.
If you use the system’s firmware boot override you can boot without using grub.
If you are prepared to do this - manually - I recently stumbled upon [User:ZachHilman/Installation_-Btrfs%2B_LUKS2_%2B_Secure_Boot] page on the Arch Linux Wiki - totally unsupported even on Arch Linux - but you may find it being good primer on the whole encryption/setup/installation/maintain process.
I have installed a Manjaro Linux using the recipe - some small adjustments must be made - those adjustment requires you to keep a specific kernel but that should not be an issue as the current LTS is 6.6.