In QuickBooks Online (QBO), the ability to remove the Income taskbar in the Invoices page and Dashboard is currently unavailable. This serves as a guide for you to monitor your paid, open, overdue invoices.
I'll pass along your suggestion to our Product Developers. They're always looking for ideas to consider on how to improve QBO. In the meantime, I recommend visiting our Blog site. This is where we share recent happenings and future developments, such as updates to newly added features.