Hi debf1, let's perform some troubleshooting steps, as this appears to be a browser-related issue.
Before creating an expense, ensure that it is not marked as Out of Scope of Tax, as this will automatically hide the tax column. If the tax column is still missing after verifying the scope, I recommend refreshing your account by logging in using a private or incognito browser.

You can also log in and out of your account, as this helps initiate a fresh session. Old, corrupted, or incompatible data stored by your browser can interfere with website functions. Taking these steps ensures you are using the latest version of your account.
Consider accessing a different supported browser to ensure optimal performance and compatibility with QuickBooks.
We suggest contacting our Customer Phone Support team. They have access to advanced troubleshooting tools and can work with you directly to identify the root cause of the sales tax column disappearing.
You can leave a comment below if you have additional questions or concerns. We are here to help.