Unlike most web browsers, Internet Explorer displays tabs next to the address bar, on a single row. If you are not comfortable with IE's current layout and want to change the way the tabs are displayed, then you have come to the right place.
How to Enable a Classic Tab Bar in Internet Explorer
You can make IE display tabs on a separate row using the Group Policy Editor.
The default tab bar:
Here's how IE displays the tabs by default:
The modified tab bar:
Below is the modified layout, with the tab bar lying right under the address bar:
Open the Run menu and type gpedit.msc. Press Enter to open the Group Policy Editor and then navigate to Computer Configuration > Administrative Templates > Windows Components > Internet Explorer > Toolbars:
Double click on Display tabs on a separate row and select Enabled: