By default, the number of attendees on a webinar is visible to the audience. However, you can choose to hide this number.
Step 1: Go to My Webinars.
Step 2: Find the webinar where you want to hide the number of attendees, then click Enter Studio to the right.
Step 3: In the webinar studio, scroll down the page to find the number of registrants and attendees, right underneath the webinar screen. Clicking the toggle to the right will hide these numbers from the audience (the numbers will remain visible to you, though they will appear grayed out).