grapheine I believe your GmsCompat notification is preventing the display of the double-line clock. The large clock only appears when there are no notifications in the foreground.
You can "minimize" the GmsCompat notification so that it only appears when you pull-down the Quick Settings menu...just long-press the notification, select the settings cog, go into the highlighted notification settings (I think it's the one called Sandboxed Google Play is running), and toggle Minimized or disable it entirely.