Change the template of multiple multisite pages at the same time
If these pages are using the default page.php template, just create a file called page-{slug}.php. So for example, if each subsite has a page with a slug of ‘my-cool-page’ you’ll create a template file called page-my-cool-page.php, upload it to the active theme, and all of the pages with that slug will automatically use that template. … Read more