hide dock

When I hit "f" shortcut to hide/show the dock at the bottom window where there are tabs for mixer, midi editor, media exlorer, each time a tab with an empty midi toolbar opens. How can I avoid this.

Try Alt + D instead, that is the shortcut for the action View: Show docker. By default shortcut F is for Toolbar: Show/hide toolbar docker.

Ald + D show/hide top dock but I want to show/hide bottom dock !