Is your feature request related to a problem? Please describe.
Not a problem of course, but instead of making this functionality happen icon by icon, I would really like if we could "fade out" TMW groups based on combat state. AFAIK, the group setting is all or nothing, invisible out of combat, visible during combat.

Describe the solution you'd like
Perhaps something similar to the icon Opacity & Color sliders? When "Only show in combat" is checked, a slider exists to control opacity for the group?

Additional context
Regardless, thank you for all your work on this amazing addon.

"Only show in combat" and group conditions are both very deliberate in their functionality in that they "turn off" the entire group when they are not in a passing state, stopping updates of all the icons within.

That doesn't mean that a change like this couldn't be made, but at this point it is very unlikely that I would do this.