This is a great question! Can I ask why you may want to implement this function?
You would need to add custom code to your store that would be able to hide products based off the tag. I would recommend reaching out to a Shopify Expert here at this link or working with your developer. Shopify experts can carry out custom jobs on your store such as this for a fee.
Another option for you is to use a third party app. Here are some I found below;
Hopefully, either of those options work for you. Aside from that, how is business going right now?
Maz | Social Care @ Shopify
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