Please report issues in the Field groups add-on here.
Hi Abdo. First, thank you for the great add-on!
I noticed that the add-on seems to interfere with the “double-click to expand” feature.
Only tested on Anki 23.12 beta3, Windows 10.
Here is an example:
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Before using the add-on:

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After selecting any Field group:

As you can see, there is no frame around the picture and (double-click to expand) is not shown. Also, double clicking has no effect on toggling the size of the image (the
button still works though)
Should be fixed now. Thanks for the report.