This page of the guide to Far Cry 6 explains whether you can use a flashlight to light up dimly lit locations. You'll also learn whether you can increase the overall brightness in the game.
As you play Far Cry 6 , you may be forced to explore many dark, dimly lit locations, such as caves and ruins. Your field of view may also be limited when roaming the game world at night.
Unfortunately, the developers didn't implement a flashlight that you could use anytime. The flashlight is in the game, although it turns on automatically in selected locations, for example when you enter the sewers or an extremely dark cave. In other dimly lit locations, you are on your own.
You can look for a solution to this issue in the options menu. It includes brightness level settings and HDR adjustments. You can check out different settings and look for a more optimal one for you.