Reducing transmit power levels is the most effective way to control the range and coverage area of the wireless signal, thereby minimizing signal leakage outside the intended area. Disabling SSID broadcasting only hides the network name but does nothing to contain the signal. Implementing MAC filtering is a method to control access to the network, not to reduce signal propagation. Enabling WPA3 encryption secures the data transmitted over the wireless network but also does not limit signal range.