More than one result to choose from

Hello..
Can someone please advise...
I am amending a form which brings back an image from a table, but there are more than one within this table and I need to give the user the option to choose which one is viewed.
Any suggestions/help/advice is greatly appreciated.
TIA

Michael, thanks for that quick response! Yes, that was it. Of course I don't know why I would have selected that option. It would seem to make sense to put this option in the Preferences instead of Edit - it would make it less easy to change accidentally.
Regards,
Francis.

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