You can easily hide or remove the top navigation bar from your blogger website. You just need to add a simple CSS code.
– Go to Design -> Edit HTML of your blogger website.
– Add the following CSS code (You can write the CSS code inside style tag OR, you can put it in the CSS section directly):-
#navbar-iframe { height:0px; visibility:hidden; display:none; }
– Refresh your website.
The top navigation bar should be hidden now.
Hope this helps. Thanks.