How do I delete a canceled company in the list of companies to choose from upon logging in to Quickbooks Online?

Good afternoon, @ehong33. 

It's great to see you back in the Community. I can help answer your question about canceled companies on this page. 

As of right now, the canceled company on this list can't be deleted until after a year. QuickBooks Online allows you to review this company and print off any information needed for a year for your business. Here's a guide with some additional information: Cancel your QuickBooks Online subscription or trial.

You can always send feedback to our Product Developers so they can consider this in the near future. Check out the Blog site to keep up with what's new in the system. 

I'm only a post away if you have any more questions. Best wishes!