How to measure active user for "click event" in real time google analytics -

i've added "click event" on google analytics, when click, popup window shows. on "real time > event" shows increment on active user. need know if user close popup active user decrements ? want know how measure active user ? thanks!

from moment there activity user counted active.

for example if thing measure on page event , no pageviews, user show active moment event triggered.

that said, user inactive when has not performed measured actions (pageviews/events/..) on website specific amount of time , can configured in admin section.