! 

I have been battling with this issue for over two years now with the iPad Pro 12.9 and QuickBooks online. As professional and courteous as the web developing team is over a QBO, they don’t have the answer and we’re completely ignorant of the situation.I then went to Apple and raised hell, they finally did a hardware swap. It did nothing!

I finally came across. SKYFIRE  in the App Store. It is not 100% but is 1000 times better than safari Firefox Internet  Explorer or chrome.

The biggest issue I had was being able to hit the little drop-down button next to the save and close button at the bottom right hand of the screen every time you do one of the transactions from the drop-down. The trick is to turn it in landscape mode and not to readjust The screen.

I hope this helps!