Filtering on filenames

I was so close! :slight_smile: I didn't know to type * first... Thanks wowbagger@

Additional questions:
How do I display the vertical toolbar?

I want just one program instance of Directory Opus.. I found 2 options that greatly reduce the number but it looks like I'm overlooking a third option.
I'm currently using these settings: Always re-use a single window instead of opening new windows