script will hide all the shareppoint default icons

$(document).ready(notRequiredElement);

function notRequiredElement() {

    $("a[id$='_share_button']").css("display", "none");

    $("a[id$='_SyncPromotedAction']").css("display", "none");

    $("a[id$='_follow_button']").css("display", "none");

     $("a[id$='_SiteActionsMenu']").css("display", "none");

      $("a[id$='_TopHelpLink']").css("display", "none");

      $("a[id$='_fullscreenmodeBtn']").css("display", "none");

}