Hi Team,
We want to apply custom Master Page for all newly created subsites in SharePoint 2013 Online, for that we tried to enable checkbox for “Reset all subsites to inherit this site master page setting” in Master page setting under Look and feel section, but when we save this, and open this page again, see again uncheck this option, so it is not saving this checkbox values.
Please help to apply custom Master Page for all newly created subsites in SharePoint 2013 Online.