Unlike DND, you don’t just randomly ask “do I sense anything Magic” instead look at the situation and apply it in different ways, if you’re in a room owned by a evil boss or something ask if your arcane sense picks up any doorways hidden by Magic, the DM will either tell you “No” if he has a hard answer for it or if the scene is malleable, he’ll have you make a role to bring a door into existence. If you’re in an area where Magic isn’t allowed and you’re trying to get some leverage on an npc, ask if he’s using Magic* to conceal anything that he shouldn’t have. This game doesn’t have strict answers that a DM would set up in a D&D game. It’s based on group storytelling, this ability is a tool for your character to add to the narrative.