[BetterRed]

I can't find a way in the GUI, I found mine in the gui.py.json configuration file:

  "save_to_disk_template_history": [
    "{authors} - {title}", 
    "{author_sort} - {title} - {:'format_date (raw_field ('pubdate'),'yyyy-MM-dd')'}", 
    "{author_sort} - {title} - {:'format_date (raw_field ('pubdate'),'yyyy-MM-dd')'|- |}", 
    "{author_sort} - {title}- {:'format_date (raw_field ('pubdate'),'yyyy-MM-dd')'|. |}", 
    "{title}. {author_sort}. {:'format_date (raw_field ('pubdate'),'yyyy')'|. |}", 
    "{title}.{author_sort}.{:'format_date (raw_field ('pubdate'),'yyyy')'|. |}", 
    "{author_sort}. {title}{:'format_date (raw_field ('pubdate'),'yyyy')'|. |}", 
    "{authors} {series:| - [|} {series_index:||]} {title:| - |}", 
    "/{author_sort}/{title}/{title}", 
    "{author_sort}/{title}/{title} - {authors}"
  ],

Usual caution when editing config files, close calibre, take a copy of the file before editing.

@Kovid - in Dark mode the top edit box in the Template Editor dialogue is black on black.

BR