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(1) From my Calibre main library (on my PC), I right-clicked the column header, "ISBN".
(2) I selected, "Add your own columns" from the drop-down menu.
(3) I selected, row 9 (in my case), "ISBN".
(4)I clicked on the "Edit settings of a user-defined column" icon at the far-right, which brought up the "Edit custom column" window.
(5) I modified the field, "Lookup name".
(6) I clicked "OK'
(7) I clicked "Apply"
(8) I restarted Calibre (per instruction).
I returned to my Calibre library and found all the fields in my ISBN column displayed, "Default".
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