def METHOD_NAME(self):
    """inject `ncols_desc` to fill the display width (`ncols`)"""
    d = super().METHOD_NAME
    ncols: int = d["ncols"] or 80
    # assumes `bar_format` has max one of ("ncols_desc" & "ncols_info")
    ncols_left = (
        ncols
        - len(
            self.format_meter(  # type: ignore[call-arg]
                ncols_desc=1, ncols_info=1, **d
            )
        )
        + 1
    )
    ncols_left = max(ncols_left, 0)
    if ncols_left:
        d["ncols_desc"] = d["ncols_info"] = ncols_left
    else:
        # work-around for zero-width description
        d["ncols_desc"] = d["ncols_info"] = 1
        d["prefix"] = ""
    return d