You are very welcome @ruth-palsson but no tech-guru I, I confess I only tapped the Filter box, then typed “Fiji” in the drop-down, then clicked Update.
Well, it works with iNaturalist’s “place” (really place_id, a number, e.g. 7332 for ‘Fiji’)… provided the URL is written correctly ;)
https://elias.pschernig.com/wildflower/place_id=7332&leastobserved.html?user=ruth-palsson
should have been https://elias.pschernig.com/wildflower/leastobserved.html?user=ruth-palsson&place_id=7332
and then it works beautifully.
Ruth, I am so glad the extremely simple solution I found worked for you. And Fiji being only only 4 characters to type was a bonus!
(My experience was that the drop-down menu was very user-friendly, but apparently there may be additional, more complicated ways that may also work, should you wish to explore adding additional steps.)