It's always worth reading the release notes. The toolbars have always had the ability to hide/show and they have always had vMicro menu items that can hide/show the bars only when an Arduino project is open.

You will see the new vMicro>Toolbar Auto Visibility menu item, If you want the tool bars displayed all the time then switch off auto visibility.

Notice that you can right click empty tool strip areas in VS then hide/show tool bars. If you are not using "Auto Visibility" then you can control the visibility of the tool bars yourself this way.

The new default shows users that visual micro can load only when needed instead of every time VS loads but give you flexibility to have it the way you want.