Grub2 menu does not show when I select a bootloader from UEFI menu

I am UEFI dual booting Win 10 with Manjaro using Grub2. Here are my bootloaders: [flex@mylaptop ~]$ efibootmgr --verbose BootCurrent: 0001 Timeout: 0 seconds BootOrder: 0001,0004,0000 Boot0000* Windows Boot Manager HD(1,GPT,91383c96-901f-403a-8de5-363c8eb6f581,0x800,0x32000)/File(\EFI\Microsoft\Boot\bootmgfw.efi)RC Boot0001* Grub Menu HD(1,GPT,91383c96-901f-403a-8de5-363c8eb6f581,0x800,0x32000)/File(\EFI\manjaro\grubx64.efi) Boot0002* UEFI Onboard LAN IPv4 PciRoot(0x0)/Pci(0x1c,0x0)/Pci(0x0,0x0)/MAC(qwerty123,0)/IPv4(0.0.0.00.0.0.0,0,0)RC Boot0003* UEFI Onboard LAN IPv6 PciRoot(0x0)/Pci(0x1c,0x0)/Pci(0x0,0x0)/MAC(qwerty123,0)/IPv6([::]:[::]:,0,0)RC Boot0004* Windows Boot Manager HD(1,GPT,91383c96-901f-403a-8de5-363c8eb6f581,0x800,0x32000)/File(\EFI\manjaro\grubx64.efi)WINDOWS.........x...B.C.D.O.B.J.E.C.T.=.{.9.d.e.a.8.6.2.c.-.5.c.d.d.-.4.e.7.0.-.a.c.c.1.-.f.3.2.b.3.4.4.d.4.7.9.5.}...6................ By the way what's with all those extra characters at the end of the Boot0004* Windows Boot Manager entry? The two Windows Boot Manager entries get auto generated, I didn't make them. I only made the Grub Menu using efibootmgr. When I let the laptop boot itself I get the Grub menu just fine I guess because this bootloader is loaded because it points to Grub: Boot0001* Grub Menu HD(1,GPT,91383c96-901f-403a-8de5-363c8eb6f581,0x800,0x32000)/File(\EFI\manjaro\grubx64.efi) However if I hit F12 to get in to the BIOS and then select the same "Boot0001* Grub Menu" bootloader from there then the Grub Menu will not show. When the timeout expires the last OS that I had selected from the Grub menu loads. It's like the graphics don't work in Grub when I select a \EFI\manjaro\grubx64.efi bootloader manually from the UEFI BIOS bootloader select menu screen. I can see a think line at the top of the screen with garbled text... but no Grub Menu. Is this a limitation of my BIOS firmware maybe? I tried re-creating the "Boot0001* Grub Menu" bootloader entry as "Boot0001* Windows Boot Manager" but I get the same result. I also tried various things in the Grub config file such as with the fx graphics (currently set to auto) but that didn't make any difference either. This is my /etc/default/grub GRUB_DEFAULT=saved GRUB_TIMEOUT=5 #GRUB_TIMEOUT_STYLE=hidden GRUB_TIMEOUT_STYLE=menu GRUB_DISTRIBUTOR="Manjaro" GRUB_CMDLINE_LINUX_DEFAULT="quiet apparmor=1 security=apparmor udev.log_priority=3" #GRUB_CMDLINE_LINUX_DEFAULT="apparmor=1 security=apparmor udev.log_priority=3" GRUB_CMDLINE_LINUX="" # If you want to enable the save default function, uncomment the following # line, and set GRUB_DEFAULT to saved. GRUB_SAVEDEFAULT=true # Preload both GPT and MBR modules so that they are not missed GRUB_PRELOAD_MODULES="part_gpt part_msdos" # Uncomment to enable booting from LUKS encrypted devices #GRUB_ENABLE_CRYPTODISK=y # Uncomment to use basic console #GRUB_TERMINAL_INPUT=console # Uncomment to disable graphical terminal #GRUB_TERMINAL_OUTPUT=console # The resolution used on graphical terminal # note that you can use only modes which your graphic card supports via VBE # you can see them in real GRUB with the command 'videoinfo' GRUB_GFXMODE=auto #GRUB_GFXMODE=1024x768 # Uncomment to allow the kernel use the same resolution used by grub GRUB_GFXPAYLOAD_LINUX=keep # Uncomment if you want GRUB to pass to the Linux kernel the old parameter # format "root=/dev/xxx" instead of "root=/dev/disk/by-uuid/xxx" #GRUB_DISABLE_LINUX_UUID=true # Uncomment to disable generation of recovery mode menu entries GRUB_DISABLE_RECOVERY=true # Uncomment this option to enable os-prober execution in the grub-mkconfig command GRUB_DISABLE_OS_PROBER=false # Uncomment and set to the desired menu colors. Used by normal and wallpaper # modes only. Entries specified as foreground/background. GRUB_COLOR_NORMAL="light-gray/black" GRUB_COLOR_HIGHLIGHT="green/black" # Uncomment one of them for the gfx desired, a image background or a gfxtheme #GRUB_BACKGROUND="/usr/share/grub/background.png" GRUB_THEME="/usr/share/grub/themes/manjaro/theme.txt" # Uncomment to get a beep at GRUB start #GRUB_INIT_TUNE="480 440 1" # Uncomment to ensure that the root filesystem is mounted read-only so that # systemd-fsck can run the check automatically. We use 'fsck' by default, which # needs 'rw' as boot parameter, to avoid delay in boot-time. 'fsck' needs to be # removed from 'mkinitcpio.conf' to make 'systemd-fsck' work. # See also Arch-Wiki: https://wiki.archlinux.org/index.php/Fsck#Boot_time_checking #GRUB_ROOT_FS_RO=true **My question** How can I make the Grub menu appear when I select Boot0001* Grub Menu OR Boot0001* Windows Boot Manager from the UEFI BIOS bootloader menu? Thank you in advance!