This article assumes you read this article and know how to run a live webinar with OBS. If not please read this first.

How to run a Youtube Live webinar with OBS

How to run a Twitch Live webinar with OBS

You can show any app on your desktop using Open Broadcaster's "Window Capture" source.

To do so, open your OBS app. In "Sources" click on the "+" button and from the options, select "Window Capture". Then give it a name, and in the next popup, from "Window" select what you want to show the attendees. e.g. I selected the browser tab that I wanted to show.

You can resize the source in the preview if you want to just show a certain part of the app.

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