I've recently purchased the DLCs on sale, and boosted my new character to level 80. However I keep getting an annoying prompt telling me to level up my mastery. The problem is I need to complete certain a story mission to unlock my mastery, but I've yet to complete the main campaign, so I'm reluctant to look into it to avoid any potential spoilers. Is there some way of turning off the prompt? It's seriously popping up every time I earn experience.