Hi, Rakesh, As far as I know, there is no Banner object or Banner property in BC Customization, so there is no situation where it can be changed.
And the link you provided mentions Office 365 administrators, so I think it's talking about the SaaS version, not for the On-Pre version.

In On-Pre, the only thing we can change is the Company Badge you mentioned.
But as Peter tested, it only shows a very small one in the upper right corner. This is similar to the System indicator feature of NAV.
More details: https://yzhums.com/20817/
Hope this helps.
Thanks.
ZHU