I appreciate the information that you've given, @kaisersy.
Allow me to step in this conversation and provide some insights about the user roles in QuickBooks Desktop.
Currently, hiding the vendors' information when opening a purchase order in QuickBooks Desktop isn't an option for us. The options provided by my peer @juVielL above, are the only restrictions that we can offer.
However, I can see how this option would be beneficial to you and your business. We always aim to deliver customer satisfaction, that said, I'll submit feedback on your behalf to our developers. Doing this helps them asses on how we can improve your QuickBooks Desktop experience.
This should get you moving today.
Don't hesitate to reach back out to me if you have any other concerns with QuickBooks. Wishing you and your business continued success.