Let me share a few things about the Management Reports template in QuickBooks.
The prepared date on your Financial Report page cover is currently set as a default field on the template. You can modify this, however, there's no option to remove this entirely. For other things you can edit on the pre-made templates, you can check out this helpful guide: Management Reports Overview.
Feel free to get back here if you have other questions. I'll be around to help. Take care and have a wonderful day!