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For running J!5.1 you must https://fabrikar.com/forums/index.php?wiki/update-from-github/ or include the new file manually https://fabrikar.com/forums/index.php?threads/joomla-5-1-and-fabrik-cannot-find-files-error.54473/post-285151 See also Announcements
Following your other thread this is done with a cusomized edit link? (which usually would open a form, not a list)
Check for JS errors.
Thank you for your reply , i eventually use a calc field to calculate the url and add the place holder to the custom link with this in place i will display a separate url clickable link for the user to respond to the list with the php plugin in a non popup manner"Hope is the last things that dies" as it's said
In some projects I have used Jack Moore's jQuery Colorbox for modals which is very powerful, but quite easy to use. With that you can have iframe modal windows which are basically the same as "normal" browser windows, so they shouldn't "interfere" with the "main" window. So in your case the php list plugin should work normally.
Of course it has as a small learning curve, but they have a good documentation.
If you need, you could also have list edit and details button opening forms/details in Colorbox modal with Fabrik layout overrides (see wiki).