How to turn off the default Navbar on Blogger.com
You may be thinking what is the Navbar and why do you may need to turn it off?
Well, it depends on your blog's purpose and style, but the Navbar is a navigation bar that lets visitors move from your blog to other Blogger.com blogs. It looks like the second screenshot below.
Step 1 - Log into the "Layout Settings"
Step 2 - Find the "Navbar" gadget and click "Edit"
Step 3 - Select the "Off" option and turn off the Navbar on Blogger
Of course, it's up to you if you'd like to keep it. One plus for keeping the bar is the "Share" function so that visitors can share your blog.