Full Screen Minimize 20 Filled icon

<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" width="24" height="24"><path fill="currentColor" d="M15 5.5a.5.5 0 0 1-.5-.5V2.75a.75.75 0 0 0-1.5 0V5a2 2 0 0 0 2 2h2.25a.75.75 0 0 0 0-1.5H15ZM5.5 15a.5.5 0 0 0-.5-.5H2.75a.75.75 0 0 1 0-1.5H5a2 2 0 0 1 2 2v2.25a.75.75 0 0 1-1.5 0V15Zm9 0a.5.5 0 0 1 .5-.5h2.25a.75.75 0 0 0 0-1.5H15a2 2 0 0 0-2 2v2.25a.75.75 0 0 0 1.5 0V15Zm-9-10a.5.5 0 0 1-.5.5H2.75a.75.75 0 0 0 0 1.5H5a2 2 0 0 0 2-2V2.75a.75.75 0 0 0-1.5 0V5Z"/></svg>