Sites users often ask how to remove the (i) info icon that appears at the bottom of Google Sites pages.
This is not possible unless you are a paying Google Workspace customer.
And even if you are a paying Google Workspace customer, the icon cannnot be removed for Sites that are available outside the domain - i.e. Public Sites
See this pinned post https://support.google.com/sites/thread/6550514
and Steegle's article https://www.steegle.com/google-sites/how-to/site-info-settings