It would be helpful if we had the ability to add some custom help text or notes to apps and / or screens and / or fields.
Maybe the ability to view the text could be provided via a ? icon or a push-and-hold / right-click / option-click method or maybe a hover or swipe action... something.
The text could be configured statically via the app builder and / or possibly even dynamically via reference data or external link(s).
Some examples / use cases might be data entry instructions, internal support numbers / links / email addresses, reminders, example data entry, what to do if the value needed is not in the drop-down, etc. The list of possible applications for this feature goes on and on.
Edit: I know you could do some of this via check boxes / hidden conditional static text fields, etc... it would just be easier if each app and / or screen and / or field had an additional property for it and then the functionality was just built in to the system.