Hello Ramkumar,
Here is the code for remove or replace it with your own logo. I hope will work.

<template id="website.layout_logo_show" inherit_id="website.layout" customize_show="False" name="Show Logo">    
    <xpath expr="//header//a[@class='navbar-brand']" position="replace"/>
</template>

Hello everyone,

I want to remove the logo permanently from the navigation menu bar on the website, Which has the option on dashboard -customize - main layout --> show logo toggle button on/off this is used to show and hide logo temporarily and replace by our own logo on settings option.

But the question If we create a website newly from scratch without using the theme common template navigation bar, we want to change the design of the navigation menu of our own and different size so at the point how we would overcome through code  ?