Make it easy and only split / and /home. If you install in UEFI mode, certainly you will need to assign the existing ESP as /boot/efi for your Manjaro install as well.
Make sure
Secure boot is disabled
Fast boot is disabled
Fast Startup is disabled in Windows
SATA is set to AHCI and not to RAID
Boot live ISO in same mode as your Windoze is installed.
UEFI + gpt parted disk OR BIOS + msdos parted disk, don’t mix these options!