In a nutshell, if you don't want it seen by the other people on your meeting, close it down.
Before using Webex in the Chrome browser, you need to install the Webex for Chrome extension. You can find and install it here.
If you don't install it, Webex will open but you cannot start or join any meetings.
Download and install this utility to replay a WebEx recording in a standalone player or convert your .arf WebEx file to MP4.
The Webex Meetings desktop app allows you to start and join meetings quickly from your meetings list within the app without going to your calendar or Webex site. It also allows you to add a Webex meeting directly in Microsoft Outlook. The Windows version also supports integrations with Microsoft Office.