How to remove format strings from "Tag - Filename" option

I have quite a few wrong format strings in my Tag - Filename conversions.

I would like to delete a few, but couldn't find an option to delete them. I also tried hitting [DEL] while in the list.

Any possibility to remove format string entries?

Yes. Open the converter dialogue and click on the button with the right-arrow. In the menu you find the option to delete the current or all entries.

Select the format string, klick on the arrow-buttion at the right end und selct "Remove from history".

Shift+delete works also