Question
I can hear an echo in the presentation that I am viewing, but I am not a presenter, how do I eliminate it?
Answer
First of all it's important to ensure that you don't have a microphone turned on and are not participating in presentation stream. You may experience an echo from one or several presenters if they are not using headphones during their stream and hence an echo experience can be created due to voices being streamed and transmitted through different presenter webcams.
There is not much that can be done here for you as an attendee, but you may want to let your event host know either in the live chat or privately that you are experiencing echo in the presentation, as your fellow attendees may experience the same.