SharePoint Online: Team site is not responsive

Scenario: My team site is not responsive on mobile devices

• If you have an existing custom master page, by using Custom Master Page and provision script to apply it
  PnP Example:

  #enable publishing feature on all sites
  
  $subWebs = Get-SPOSubWebs
  foreach ($web in $subWebs) {
  	Enable-SPOFeature -Identity "94c94ca6-b32f-4da9-a9e3-1f3d343d7ecb" `
                            -Force -Web $web.ServerRelativeUrl
  }
  #Add/update the master page
  Add-SPOMasterPage -SourceFilePath "C:/temp" -Title "master.aspx" `
                    -Description "customer master page" `
                    -DestinationFolderHierarchy "test" -UiVersion 15
  
  #Apply it on the root site
  Set-SPOMasterPage -MasterPageServerRelativeUrl $MasterPageServerRelativeUrl `
  		  -CustomMasterPageServerRelativeUrl $MasterPageServerRelativeUrl
  
  #Apply it to all subsites
  $MasterPageServerRelativeUrl = "/_catalogs/masterpage/test/master.aspx"
  $subWebs = Get-SPOSubWebs
  foreach ($web in $subWebs) {
  Set-SPOMasterPage -MasterPageServerRelativeUrl $MasterPageServerRelativeUrl `
              -CustomMasterPageServerRelativeUrl $MasterPageServerRelativeUrl `
    	    -Web $web.ServerRelativeUrl
  }
  
  

• Register Site Action and use jQuery to apply responsive elements: e.g: https://github.com/SharePoint/PnP-Tools/tree/master/Solutions/SharePoint.UI.Responsive, but if you already have customized publishing site, you might have to modify the scripts to apply these responsive actions only to certain site templates.

•     .\Enable-SPResponsiveUI.ps1 -TargetSiteurl "https://intranet.mydomain.com/sites/targetSite"
  

• Using SPMeta2, example code snippet

  
   public ModelNode GetModel()
   {            
         var model = SPMeta2Model.NewWebModel(rootWeb =>
         {
             rootWeb.AddWeb(intranetWebs.TeamSites, web =>
             {
                  web.AddMasterPageSettings(intranetMasterPages.masterPageSettings);
                    
             });
         });
         return model;
  }
  
  public static class intranetMasterPages
  {
      public static MasterPageSettingsDefinition masterPageSettings = new MasterPageSettingsDefinition
      {
          // both should be site relative URLs
          SiteMasterPageUrl = "/_catalogs/masterpage/Intranet.master",
          SystemMasterPageUrl = "/_catalogs/masterpage/Intranet.master"
          //"/_catalogs/masterpage/seattle.master"
      };
  }
  

• More(TBA)…