iOS App cannot access settings

Ever since the most recent app update from the app store (v 2.4.56) I can no longer access the connection settings page for the app, tapping on the 3 bars at the top right does nothing. I tried uninstalling and reinstalling the app but now it has reverted to demo mode and I still cannot access the settings page.
I am having this problem with iOS 12.5.6 (iPhone 5s) and iOS 15.7.1 (iPhone 7), however v2.0.3 on my old iOS 10 iPad is working fine

Same problem - but I do not even have the 3 bars showing