From Twitter:
https://twitter.com/jackbasford/status/972945350527987713
Anyone playing iGP on an iPhone/iPad - I applied a hotfix for the iPhone X "notch" earlier which caused issues with the menu on some other iOS devices. A "fix for the fix" has just gone up that should get everything working nicely on all iOS devices.
This notch fix only applies to the management screens. A patch for the live race viewer will arrive in the next update/patch.