Can I 'invert' a bool?

This would be inlined, so readability increases, runtime costs stays the same:

public static bool Invert(this bool val) { return !val; }

To give:

ruleScreenActive.Invert();

I think it is better to write:

ruleScreenActive ^= true;

that way you avoid writing the variable name twice ... which can lead to errors

You can get rid of your if/else statements by negating the bool's value:

ruleScreenActive = !ruleScreenActive;

ruleScreenActive = !ruleScreenActive;