Layer options is gone specially in children Layers made with earlier version of Illustrator
I used to double-click over any layer to activate the layer option dialogue box.
recently after updating to Illustrator 2021 the layers option is gone especially with files I have made with earlier Illustrator Version and on children layers only.
all layers I have made in an earlier version of Illustrator have colors that I couldn't change in the newer version of Illustrator.
This is what I got when double-click over any layer to change its color for example.

