You can choose between dark, light, or system theme in iOS 13. If you have iOS 11 or 12, you can choose light or dark theme. For iOS 13: On your iPhone or iPad, open the Gmail app . At the top left, tap Menu Settings. Tap Theme. Choose Light, Dark, or System default.
Note: This feature is called Dark mode on Desktop and Dark theme on mobile devices. When you browse in Dark mode or Dark theme in Chrome, your homepage, toolbar, settings, and some other pages will be dark. Note: Dark mode is available on iOS 13 and up.
A list of iOS apps that support Dark Mode like Twitter, Reddit, Pocket, Google Maps, Telegram, and many other. A list of iOS apps that support Home iOS iOS DARK MODE LIST
Same boat.. Iphone 8+ and updated gmail app.. tried google searching and until now i felt like I was only person with this issue.