I have a lot of templates in for filters that I would like to prune and clean up. How do I do this?
OK, the screenshot shows the entries for Filename-Tag and not
but I take it as a general problem:
Click on the right-arrow-button and select "Manage history ..." which opens a dialogue in which you delete entries and also add descriptions.
This function is also available for filters.
You can find more details here in the documentation:
Danke @ohrenkino for the solution, even though my description of the issue was a bit off