In any case, here is what I've done:
To change from ‘grub-quiet’ package to grub package.
sudo pacman -S grub
Say ‘y’ to remove grub-quiet.
Review and correct your /etc/default/grub and
This did not make any change.
reset the GRUB_TIMEOUT_STYLE=menu to
I get the countdown... & when I press escape, it boots to Manjaro...
Thinking this is a menu problem, I have installed GRUB Customizer (saw this on another post) from the repository and moved things into a menu.
Now when I press escape I get a menu.
Back to my original issue that when I boot into 4.20 I can not use my USB video import devices.