Temporary Black Screen?

Is there a way to add a custom black screen temporarily?

For example, I'd like to show on my screen a custom 'At Lunch' feature only part of the day so that my in-office co-workers know not to disturb me during my break. The standard screen is fine during the rest of the day while I'm working.

I was wondering if there was a way to do this and if there is an easy way to turn on/off this feature?

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