iPad Pro has a black line
My iPad Pro displays a black line across the screen intermittently, I’ve tried to update the software, restart the iPad. This issue continues.
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A reliable method to confirm a screen or other hardware fault is to take a screenshot when the fault is evident - and then review the captured screenshot image...
When reviewed, if the lines are not present in the screenshot image, then you have demonstrated that you have a hardware fault that, sooner or later, may become sufficiently severe that repair or replacement of the iPad are the only options. If the lines are visible in the screenshot, the something other than hardware will be the cause.
Note: When reviewing the image, rotating the iPad screen orientation by 90°, from Portrait to Landscape, will ensure that the image does not coincide with screen defects if present.
Take a screenshot on your iPad – Apple Support
If your iPad requires repair:
iPad Repair - Official Apple Support
Genius Bar Reservation and Apple Support Options - Apple