why does my iMac go off line during Zoom

Hi SingerCaoch,

We'll be glad to look into this with you further. If it's happening only with the Zoom application specifically, then their software is likely interfering with your Mac in some way and causing this to happen. With that said, you would need to reach out to Zoom to look into this with you further: Zoom

However, if this is occurring when using the Zoom feature on your iMac, let us know which method you're using in the article that you came to us from: How to zoom in or out on Mac - Apple Support

Does the same behavior occur if you try a different method suggested in the article?

Additionally, we'd recommend restarting your Mac using the steps here, since it can often resolve abnormal behavior that you may experience: Shut down or restart your Mac - Apple Support

Cheers.