How to close onlyoffice window?

The “Open File Location” option is a terrible alternative to the close button because this does not close the active session and keeps the document in memory.

EDIT: Here is an interesting tidbit, I recently upgraded my server, if you are using NC20 and open a document from the Dashboard, a close button exists. And when you close a document it’s almost an instant save as well, it closes the session much quicker.