There are a few additional tips that can make creating a site that much easier. I know, it’s hard to believe that Google has tricks that can make an already easy tool, easier.
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Nowa Techie 
HI there,
Do you know how we can enable a sidebar menu in the new google sites?
Thanks in advance!
Not at the moment. You can put it in as a suggestion. Google is good about listening to our needs/wants.
Actually, yes you can. Simple to do. When editing hover over the navigation bar at the top. A gear will appear. Click on that and choose ‘Side Navigation’.