Hi @Scobie,
Could you please share a bit more about your scenario?
Do you want to display the border of the control when they are in Display mode of view?
I afraid that there is no direct way to achieve your needs in PowerApps currently. I agree with @Drrickryp's thought almost.
I have made a test on my side, please take a tey with the following workaround:
Add a Label control, and then Overlay the label over the control (you want to display border), Set the BorderThickness property of the Label control to 2, Set BorderColor property of the Label control to RGBA(56, 96, 178, 1).
Set the Visible property of the Label control to following formula:
If(Control1.DisplayMode=DisplayMode.View,true,false)
Note: The Control1 represents the controls that you want to display border.
Best regards,
Kris