The z-index value specifies the stack order of HTML elements. Elements with a higher z-index will be placed on top of elements with a lower z-index.
To modify the z-index value for the WhatsApp icon, navigate to Click to Chat -> other settings
At advanced settings, we can modify the z-index value.
The default z-index value is 99999999.
Note: Add only positive values for z-index. For better visualization of the WhatsApp icon, use the default z-index value.