Quadruple boot: Win10 + Mint + Manjaro XFCE + Manjaro JDE

Im probably in the wrong place for this, but as a TOTal neb to this forum thing - i registered, but to NEVER figure out how to post. Ya, i know — what-a-ya-want. i’m 66 n doin my best. been using mint for 4+ years. WinDoze of cousre like forever (JUNK) … Anyway. i have 2 ssd’s. one has Mint 20 Cinomin and Manjaro KDE onit. The other an M.2 with win10. Then I wanted to try ALSO ManjaroFfce. So i put it next to win 10 on free space, 250gig. it’ll still boot into win10 from grub menu, boot into mint from grub. The grub was updated away from Mint’s grub to Manjaro’s during install. All went and was well till i put Manjaro next to win10. Grub says it’s there, but when I choose that one to boot … It seems to start - then thats about as far as it gets. Or is 4 OS’s kinda like — OVER THE TOP … Just lke me …
Dell Precision 7710
32 gig’s ram
1 T byte M.2, and a WD 500 ssd …
heres my sudo update-grub output
Generating grub configuration file …
Found theme: /usr/share/grub/themes/manjaro/theme.txt
Found linux image: /boot/vmlinuz-5.10-x86_64
Found initrd image: /boot/intel-ucode.img /boot/initramfs-5.10-x86_64.img
Found initrd fallback image: /boot/initramfs-5.10-x86_64-fallback.img
Found linux image: /boot/vmlinuz-5.9-x86_64
Found initrd image: /boot/intel-ucode.img /boot/initramfs-5.9-x86_64.img
Found initrd fallback image: /boot/initramfs-5.9-x86_64-fallback.img
Found Windows Boot Manager on /dev/nvme0n1p1@/EFI/Microsoft/Boot/bootmgfw.efi
Found Manjaro Linux (20.2) on /dev/nvme0n1p4
Found Linux Mint 20 Ulyana (20) on /dev/sda1
Adding boot menu entry for UEFI Firmware Settings …
Found memtest86+ image: /boot/memtest86+/memtest.bin
done

boot on USB iso manjaro
open a teminal and a browser on this topic
provide more info

inxi -Fza --no-host
sudo parted -l

be careful grub manjaro is not grub mint