Change site settings.

• command: spo site set -u|--url <url> -c|--classification [classification] -f|--disableFlows [disableFlows]
• url - url of the modern site to change settings for, required
• classification - classification to set, set to empty string to clear the existing value, optional
• disableFlows - boolean, set to true to disable Microsoft Flow for the specified site, optional
• requires connection to a SharePoint site

For more information see: https://github.com/SharePoint/PnP-PowerShell/blob/d8bdc49067a431b72b492ededbfefc6e3d92e7bf/Commands/Site/SetPnPSite.cs