Let's try browser troubleshooting to resolve this. Use a private window, this won't store browsing data:
For Chrome, press Ctrl+Shift+N.
For Internet Explorer or Firefox, press Ctrl+Shift+P.
For Safari, hold down Command+Shift+N.
If the Customer button is showing, let's go back to your regular browser. Then, clear the browser's cache to delete stored browsing files, check this article to know how: https://community.intuit.com/articles/1884697. You also have an option to use a different browser.
Follow these steps on how to update company address:
Click the Gear icon.
Select Account and Settings.
Go to Company, and click the pencil icon for Address.
Enter the new company address.
Click Save, then Done.
Go back to this post if you need further assistance.