              The display width, in characters, for the help text
          """
          if text.startswith("R|"):
              text = self._whitespace_matcher_limited.sub(' ', text).strip()[2:]
              output = list()
              for txt in text.splitlines():
                  indent = ""
                  if txt.startswith("L|"):
                      indent = "    "
                      txt = "  - {}".format(txt[2:])
 
</s> remove                     txt = "  - {}".format(txt[2:])
 </s> add                     txt = f"  - {txt[2:]}" </s> remove         return argparse.HelpFormatter._split_lines(self, text, width)
 </s> add         return argparse.HelpFormatter._split_lines(self,  # pylint: disable=protected-access
                                                   text,
                                                   width) </s> remove     def __init__(self, prog, indent_increment=2, max_help_position=24, width=None):
 </s> add     def __init__(self,
                 prog: str,
                 indent_increment: int = 2,
                 max_help_position: int = 24,
                 width: Optional[int] = None) -> None: </s> remove                        "Training - 'S': Save Now. 'R': Refresh Preview. 'M': Toggle Mask. "
                       "'ENTER': Save and Quit")
 </s> add                        "Training - 'S': Save Now. 'R': Refresh Preview. 'M': Toggle Mask. 'F': "
                       "Toggle Screen Fit-Actual Size. 'ENTER': Save and Quit")
            output = []
              The display width, in characters, for the help text
          """
          if text.startswith("R|"):
              text = self._whitespace_matcher_limited.sub(' ', text).strip()[2:]
            output = []
              for txt in text.splitlines():
                  indent = ""
                  if txt.startswith("L|"):
                      indent = "    "
                      txt = "  - {}".format(txt[2:])
keep keep keep keep replace keep keep keep keep keep
 Live Preview - Replace cv2 with matplotlib viewer 
lib/cli/args.py