My fire salamanders usually don't hide, they are usually out in the open probably hoping for more food lol but I have them in a very low traffic area, essentially their own room in a rather cool basement. For many years I kept barred tiger salamanders and they would often stay in the substrate partially but as soon as the lid was opened they would come up for food. To be honest, I don't spend a lot of time watching them as mentioned before they are not in a communal area. I enjoy spending 10-15 minutes a day watching them as they feed and when their enclosures need maintenance and that's enough for me. I also have a large collection of snakes keeping me busy, so if I had less animals perhaps I'd be more likely to spend large amounts of time looking at a single enclosure.