I haven’t used EN for a while - just updated to X9 version 9.3.3 on a new mac.
I use a customised output style named “Chicago 16th Footnote Copy.ens”.
I copied that file to ~Documents ▸ EndNote ▸ Styles - but it does not appear in the styles manager.
So therefore I cannot edit it!
ANSWER: Although in Folder Locations my custom styles directory looked correct (in format ~Documents/EndNote/Styles) I chose the same location again which this time inserted the full path … must have retained the path from old mac.
Could not delete this post, sorry (error about expired session/changed URL)