Reducing TX Power on mAP Lite

I’m setting up a mAP Lite to use as a hotel internet hotspot. I’d like to reduce how far my signal travels for privacy. I’ve set my tx power to 0 and even tried things like -10 and using a very high antenna gain setting with regulatory-domain, but the total TX power shows up as 0 and total TX power as 3 dBm regardless of what I try. Even through a wall, the signal is -60 dBm which seems very strong for what should only be a 2 mW signal!

Anyone have any other suggestions?