Skill priority

[Titanium]

You mean you can't even put that skill in the left-click mouse slot? normally it shouldn't be. Which skill is it?

Are you sure you disable the "Auto change skills" in settings? otherwise it'll just auto change the skills to the predefined set when the game resumes.

Moreover, you can also check if there is one or two skills in other slots which is used at a higher priority than the skill in the left-click mouse slot.