If you are working on an Editable template then you can edit it and place new content in structure or initial content section.

Can you please check inheritance stat level property anywhere? Parent page should have Iparsys or Experience fragment for header and footer.

The CSS and JS may get due to redundant data or multiple loading.

You can use cq:allowedTemplates property to define specific templates. Set property in a way that only Template B is available for use.

Can you please check /libs/wcm/core/content/sites/properties/libs/cq/gui/components/siteadmin/admin/properties/clientlibs/properties/js/properties.js .I will add if found something more

Hi You can tryhttps://github.com/AdobeDocs/experience-manager-65.en/blob/main/help/sites-administering/notification.md 

Hi All, I have used it the below code and it's working as of now.but thing this is not proper way. Configuration configuration = configAdmin.getConfiguration("com.day.cq.mailer.DefaultMailService");if (configuration != null) {// get propertiesDictionary<String, Object> properties = configuration.get...

 JeevanRaj I have tried your solution but still, I am getting mail from the sender which is configured in the AEM CQ mail service with valid credentials.I am getting emails on my Gmail ID.but the new sender is not reflected.

Email email;email.setFrom("test@example.com") - Not working 

Any working solution for this article . The provided link is not working.