Get rid of the file explorer grey bar line

I have just received my Asus ROG G750 with Windows 8.1. On the file explorer I get a grey bar that seems resizable but that doesn't move and I don't know what it is.

Here is a screenshot of the file explorer with the grey bar:

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here is a screenshot of how file explorer looks on other systems: enter image description here

I don't know why I have it and honestly I'd really like to get rid of it.


The fix is to enable "Lock the toolbars" option and it'll remove the ugly line from Windows Explorer.

Open Internet Explorer and then right-click on titlebar or toolbar and enable "Lock the toolbars" option.

enter image description here