Hi Gundula,
> from the academic and dictionary point of view, that's certainly correct.
It is also correct from a plain-English point of view.
> Nevertheless I feel that different pictures raise in the reader's mind.
> Using the word 'identify' feels more strict and somehow implies the location.
I'm not sure why that would be, "identify" has no implication of location.
https://www.dictionary.com/browse/identify
Going back to my buried treasure example: To identify the buried treasure would be to match it with a picture, description, or other representation. To indicate the buried treasure would be to point out, point to, or direct attention to it.
https://www.dictionary.com/browse/indicate
It seems to be the better word for the intended meaning.
> While the more loose new wording immediately triggers a mind image of some icon or string that says 'there are invisible elements on the page' or 'hover an item to see its options' or something the like.
In some cases that might be the best solution. E.g. "Hover over the cells in the table to see the options available." One of the cases we want to avoid is adding an icon next to every editable item in a dense display of items.
In that case, 'indicator' seems to be the better term as it includes an implication of location.
Kind regards,
-Alastair