Hi there,
Using QuickBooks Online in an Incognito window is a great way to avoid browser troubles caused by cache and cookies. This private window runs independently from the rest of your browser, and it doesn't store things like passwords or login credentials.
You can log out of QuickBooks Online by clicking the Gear icon > Sign Out. After you've signed out of the program, click the "x" in the upper right-hand side of the web page to close your Incognito browsing session.
I hope this helps you get back on track. If you have any other questions, please don't hesitate to reach out to our tech support team.
Cheers.