Are you using the Maximus page builder? If yes, you can load the layout/demo content from pages->Add New and on the new page load from library->Modern Community.
Then you can set this page as home page.
Also, please do this for customizing single page
Please do note that we are about to release Community Builder 2.0 next week and breaking away from the Maximus Page builder/1.0 look and feel.
So, if you are building a new site which can wait for a week, I will suggest to wait before getting locked in with Maximus.
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