Hi @Pankaj15,

Go to Conversational Interface > Settings > Branding and there you have unlimited options how to brand your virtual agent.

Under the branding tab, select your theme and go to Icons to replace the icon and for Colours to change its colour:

Let me know if this helped you

EDIT: added screenshots.

@Pankaj15 I just realised that the close Icon is for closing the conversation, the "X" icon as per your screenshot is a subject to your branding:

And the primary colour (maroon in my case).

@GlideFather : this process I know that but i am talking remove White X .

@Pankaj15 So you want to basically deactivate the virtual agent?