Tested under FreeBSD:
Useful shortcuts (maybe they are in documentation)
https://midnight-commander.org/wiki/doc/filePanels/hotkeys

ESC+a – copy path to command line
ESC+ENTER – copy file name to command line
ESC+h – command line history
CONTROL+BACKSPACE – delete one word from command line
CONTROL+w – delete all words from command line
CONTROL+s – search in active panel
ALT+i – active panel to another panel
ALT+o – active directory to another panel