Better Target

The default target indicator can be difficult to see in tight confines or crowded rooms. This module changes the target indicator to a crosshair that renders over the targeted token.

https://foundryvtt.com/packages/better-target

There is no configuration for this module. I know there are a few others that do give choices, but this one works for my groups, and its simple. We have a few visually challenged folks that play and the contrast on the targeting reticle works great for us.