Hey Julian,
maybe the following widget will help you: it allows you to add notifications to a screen
https://marketplace.mendix.com/link/component/45837
maybe by activating these messages during the startup and refreshing them into the screen you can help your user.
another option is:
Checklist design
if the list in whole is not what you want, you can always only show the current step and update that.
Apart from the original request: double check your native synchronization settings in the native navigation profile and your entity access. Maybe the app is syncing way more data than you expect!