3.8 manual says:
Show or hide this metadata field. Hidden fields are not displayed anywhere in darktable and are not be included in exported images.
Keep this metadata field private. Private fields are displayed within darktable but are not be included in exported images.
Fields with both options unchecked are displayed within darktable and included in exported images.”
The ‘show/hide…not displayed anywhere in darktable’ property appears, on my system, (both Linux and Win. 10) to apply only to the metadata editor area (right-hand panel); info in the ‘file information’ area (left-hand panel) always shows metadata irrespective of whether ‘visible’ is checked or not.
What have I not understood?
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