Missing "Run automatic assignments" button on Windows

I have been using HomeBank only about once per year to categorise spending over the year. The automatic assignment works really well. I typically add some more assignments in the Manage Assignments screen and then "Run automatic assignments" for the account.

However, the "Run automatic assignments" button at the bottom of the transactions screen is now missing. I have certainly used it previously, but it has now disappeared.

I was using version 5.2.2, so I upgraded to 5.5.2 and this is still the case.

Is there an alternative way to rerun the automatic assignments?

I think this is the greatest feature on HomeBank.

Many thanks,
Lester