Since the end of 2019, COVID-19 has left several impacts on people's life. To reduce the chance of infection, avoiding crowded places has been recommended by the authority. It raises a need to find an effective way to avoid high occupancy levels inside public places. One approach is using a screen located outside to display the occupancy information. This study aims to examine this method's effect and screen size on people's attention. To evaluate, various screen sizes were investigated in a natural arrangement meaning that people's activities and behaviors are observed and captured. The results show that placing a monitor outside is a sufficient way to inform customers about the occupancy's level; and the larger screen size increases the chance of getting people's attention. The research questions are implied in the sentence above. Our findings benefit those seeking a suitable solution to provide the occupancy level of the public places.