How to turn off the function so the screen does not go black

Hello,
I asked this question before in another category topic , but I think I did not solve it and my initial question was poorly phrased, so I am making a new topic for it because it is a specific problem.

How do I turn off the settings so the screen does not turn black after a certain amount of time?
My wife is saying that when she uses zoom it turns black after about 20 minutes
I know that when we watch something on youtube that does not happenhis is the settings I currently have:

this is the settings I currently have:

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