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This is one of my least favorite aspects of modern UI design practices, the user doesn't have any agency. Everything's a choice between "Yes" and "ask again later".

The update notification has a close icon when you hover the popup window. I use it all the time.

It'll ask me again later (a few days? a week?), but it won't make any changes immediately, nor will it schedule any changes.

I'm a chronic procrastinator when it comes to updating macOS, and I can confidently say that it asks me about updating _at most_ once a week (if even that), not every day and certainly not multiple times in the same day.

You can dismiss that by clicking on the notification without clicking on either option. It will pull up the System Settings, which you can then close.

You can turn off automatic updates if you want. You can even control security sensitive updates and App Store app updates separately.