How to edit custom column in calibre?
3 years ago I created a column with a dropdown list containing the years 23,24,25. Now I'm trying to add more years 26,27 and on. Unfortunately I don't remember exactly how I did it the first time, but it was easy. (I probably edited an existing option) The problem now is that I don't want to create a new column so as not to lose the old records. Please advise how to add more values to the dropdown list
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