Edit or Remove Header/Footer when printing widget

I’ve seen this response: Print View Suggestions - some tweaks - #2 by paul-grist

But it’s not my case. In my case, I have end users who will be publishing the widget of my design, and they want to customize the header/footer. If it can’t be customized, I’d like to set up my widget so that each user doesn’t have to turn off header/footer printing on their own browsers.