When in Split Screen Mode the following characters can be used to edit the line being entered.
Backspace Delete character left of cursor Delete Delete character under cursor Ctrl+X or Ctrl+W Delete entire line Left arrow Move cursor left Right arrow Move cursor right Ctrl+Right Arrow or Tab Move to start of next word Ctrl+Left Arrow or Shift+Tab Move to start of previous word Ctrl+Home Move to start of line Ctrl+End Move to end of line Enter (Return) Send the line