Is it possible to conveniently work with files in a directory tree outside the database?

I found the file explorer, but it goes as a separate window and it seems like it cannot be integrate on the left in the main window.

The reason for the Files Explorer is to enable one to use the Related Links and make connections to files. If the Explorer was external, it wouldn't be able to access the database.

I will think about how best to incorporate it, maybe by placing it into the current SideBar where the History, Downloads etc are used.

It requires some thought, but not now :)

Ok, but I would like to always have it in sight on this place:
An important point: not the entire disk, only the opened folder!
This is a kind of standard in other programs.