Each row carries its own menu: submenus for share and move, a radio choice, a favorite check, a disabled download on folders and a destructive delete. Right click, press the Menu key, or press and hold on touch.
Right-click a row, or press and hold
Labeled groups split by a rule, shortcut keys at the end (hidden on touch) and a disabled Paste that is skipped by the keyboard.
Nothing picked yet
Check items toggle in place, a radio group holds one choice, and a disabled submenu stays visible but cannot open.
Hidden files off, preview pane on, sorted by name
The parent owns open. It can read it, and close the menu from outside.