Rename symbol instance in the layers panel
When you make a symbol like a button, you draw first a rectangle with attributes like color, size, etc...
then you put a label in order to give him a function like "Validate", etc
So when you put this button inside your artboards the problem becomes that if you want to change the caption of the button you'll have to dissociate the symbol to change the caption.
So the problem is How can I use atomic approach in order to design my system and then if I change the color of the button, the size of it or the caption it repercutes on all my buttons ?
You can now rename your symbol instances in the layers panel, and separate renaming of symbols in the assets panel.