Hey Methew121,
From what we understand, the sidebar of a WordPress blog isn't available on the Apple device. Have you checked the bottom to ensure the bar isn't located there? If it isn't at the bottom, test different Themes to see if they make a difference. Some things may have the bar in a different area such as right, left, or bottom.
This article provides steps on changing or switching Themes: Change Your Theme – WordPress.com Support
If changing the them doesn't help and it isn't showing at the bottom, make sure the WordPress app is up-to-date by following the steps below:
- "Open the App Store.
- Tap your profile icon at the top of the screen.
- Scroll to see pending updates and release notes. Tap Update next to an app to update only that app, or tap Update All."
Updates not only include new features, they also include fixes. You can also view the steps here: How to manually update apps on your Apple device.
Take care.