I created a master page by creating a copy of oslo.master in by using SharePoint designer.

This is now available in catalogs/masterpage but when I try to apply it to my site using the master page option in site settings, none of the pages in pages library changes the master page.

However when I change a page's master page using designer it works. What am I doing wrong?

  • Forgot to mention. This is in SharePoint online. Nov 21, 2019 at 8:03

1 Answer 1


Do you mean that only the pages in pages library is not changed the master page?

You need to set the customized master page as "Site Master Page": The site master page will be used by all publishing pages:

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