MSI Afterburner monitoring does not display in the game . (Call of Duty: Modern Warfare (2019))

DRIVER-PC
Sometimes it helps to switch settings in RTSS...
Spoiler
...but while the game is new, it may not be defined in the program - wait until the release version is newer and it will add support for this game. Although the overlay in some games is so high (like to protect from cheaters), not to display anything on top of the game.