@@tanusaroha8197 The online cgview server does not support COG visualization. However the CGView Comparison Tool can assign and display COGs. I am planning on doing a video for that later on . If you are in a hurry you can check out a tutorial here : github.com/paulstothard/cgview_comparison_tool#using-the-cct-docker-image and paulstothard.github.io/cgview_comparison_tool/tutorials.html
if it is a bacterial genome, you can annotate the genome using tools like prokka,rast or pgap. You can then use Artemis to visualize the genbank file and add the CDS,GC content, etc. You can check my video on Artemis to learn how to do that.