I am running IOS 12.1.2 iPhone 8. I installed the Purei9 app version 6.0 but it does not have the blue square navigation function. Only have the map, start and home icon which I can start and home only.
Is it something I installed wrongly?
I am not sure what blue square navigation function you mean.
The look of the ver 6.0 app is a bit different, but all functionality is kept. The navigation buttons you see in the app depend on the context. When your robot is not cleaning you can start cleaning or send it to the charger. If your robot is cleaning you can pause the cleaning and/or send it to the charger. Sending robot to the charger stops the ongoing cleaning.
The only difference is that you cannot start spot cleaning from the app. And it makes sense actually, because you would need to move your robot to the place you need to clean and then it would be easier to press the button on the robot instead of going back to the app...