This idea would seem more relevant in conjunction with this one: Click On Pie Chart Legend Item Options.
The selection highlight effect around the the color patch in the legend was almost imperceptible to us. It almost stands out well enough, for example, around a yellow colored patch:
![DaveFullerton_0-1640644512790.png DaveFullerton_0-1640644512790.png](https://community.esri.com/t5/image/serverpage/image-id/30400i7A7FD54F25D9794C/image-size/large?v=v2&px=999)
It is especially a problem around blue patches:
![DaveFullerton_2-1640645055443.png DaveFullerton_2-1640645055443.png](https://community.esri.com/t5/image/serverpage/image-id/30402iF3A70D335EEEBF9A/image-size/large?v=v2&px=999)
We would prefer to see the highlight color as a line around the entire legend item rather than just the patch.