Is there a way to change the page properties of several pages at a time?

I don't know what version of AEM you're using, but this is a sightly class that on activation will do what you're requesting.

(This has not been tested to be accurate, however, i'm pretty sure it'll work assuming it's ran on the author instance as an administrator or author.  This was literally thrown together 2 minutes ago, so please only use it as an example)

package com.project.core.helpers; import com.adobe.cq.sightly.WCMUsePojo; import com.day.cq.wcm.api.Page; import com.day.cq.wcm.api.PageManager; import org.apache.sling.api.resource.Resource; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import java.util.Iterator; import javax.jcr.Node; import javax.jcr.Session; public class PageHelper extends WCMUsePojo { private static final Logger logger = LoggerFactory.getLogger(PageHelper.class); private String path; @Override public void activate() throws Exception { this.setPath(this.get("path", String.class)); updatePages(); } public String getPath() { return path; } public void setPath(String path) { this.path = path; } private void updatePages() { if (this.getPath() != null && !this.getPath().isEmpty()) { PageManager pageManager = this.getPageManager(); Page page = pageManager.getPage(this.getPath()); if (page != null) { Iterator<Page> children = page.listChildren(); while(children.hasNext()) { Page currentPage = children.next(); Resource contentResource = currentPage.getContentResource(); if (contentResource != null) { Node contentNode = contentResource.adaptTo(Node.class); if (contentNode != null) { try { Session session = this.getResourceResolver().adaptTo(Session.class); contentNode.setProperty("isHideInNav", true); session.save(); } catch (Exception e) { logger.error(e.getMessage()); } } } } } } } }

Do you have any example to create a tool using a API in aem? Thanks!

Its best practice to hide it when the page is created. However, if its created in bulk as @scott mentioned, can write a quick service to do the job.