The quality of web conferencing services often degrades by network quality. Parametric video quality-estimation techniques are essential to detect quality degradation because they can estimate the quality of videos displayed to each user by using information about video encoding. To study these techniques, we have to consider display layouts such as single and grid views, which are layouts unique to web conferencing videos. Therefore, we investigated the subjective evaluation stability of both views. Then, we showed the evaluation of grid views is less stable because of the smaller size of face images comprising the display and wider quality distributions.