Perhaps you are allow to change default landing page
If you allow admin to change landing page to SharePoint home page or allow admin to other default pages
Totally agree with Chad. We are revamping on old and ugly intranet with a totally new look and feel using SharePoint Online and would like it to be the landing page when opening the SharePoint app on IOS. Anyone knows if this feature is or will shortly be available ?
chad miller commented
should provide configuration in admin center or something where admin can define a url to which the app would redirect user when app is first opened