Is it possible to get a template page back once deleting them from my pages? Or using a different template page from the Specular theme but not from Business Clean?
Sorry but it’s not possible reversing back a template that’s been deleted. You can restore a previous version of your site with wordpress restore option (screenshot). But this will take the hole site in the status of that time. All changes made after that, will be lost.
To use the defaut demo pages, you have to import them first. Please know that importing another demo will overwrite your current settings.
What template do you want to use from default site?
