See Preferences / Tweaks / Control behavior of the book list (ID: doubleclick_on_library_view):
Quote:
You can control the behavior of doubleclicks on the books list.
Choices: open_viewer, do_nothing,
edit_cell, edit_metadata. Selecting anything other than open_viewer has the
side effect of disabling editing a field using a single click.
Default: open_viewer.
Example: doubleclick_on_library_view = 'do_nothing'
You can also control whether the book list scrolls horizontal per column or
per pixel. Default is per column.
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