Hello, @USER1995. We can perform some troubleshooting steps, as this appears to be a browser-related issue.
Before creating an invoice or bill, please 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 checking this setting, I recommend refreshing your account by logging in through a private or incognito browser.

Additionally, you can try logging in and out of your account, as this can help start a fresh session. Sometimes, old, corrupted, or incompatible data stored by your browser can interfere with website functions. Following these steps will ensure you're using the latest version of your account.
Consider using a different supported browser to ensure optimal performance and compatibility with QuickBooks.
If the issue persists, we suggest reaching out to our Customer Live Support team. They have access to advanced troubleshooting tools and can work with you directly to identify the root cause of the disappearing sales tax column.
Let us know if you have further questions. We're here to help you anytime.