Starting HMI Disabled and Enable after loading

Dear,

During testing we have experienced some problems during operating of our machines through the HMI we have created using AppStudio.

Loading the HMI takes some time and there currently is no real feedback on this. In our experience operators do not always wait for the HMI to fully load and press buttons. This is problematic for us, since this introduces discrepancies between between data the HMI presents and the data in the controller.

My question is, is there a method to either disable the HMI fully until it is loaded and/or present some feedback on loading?

Thank you in advance.

Kind regards,
Daan