Only display latest rows?

[SimplicityGuy]

I have some code that looks like this:

    def header():
        text = Text("Multi-Updater", justify="center")
        text.stylize("bold")
        return Panel(text)

    def region(data_type):
        grid = Table.grid(expand=True)
        grid.add_column(justify="left")
        return Panel(grid, box=box.ROUNDED, title=data_type, title_align="left")

    layout = Layout(name="root")
    layout.split(Layout(name="header", size=3), Layout(name="main", ratio=1))
    layout["header"].update(header())
    layout["main"].split_column(Layout(name="upper"), Layout(name="lower"))
    layout["upper"].split_row(
        Layout(region("region1"), name="region1"),
        Layout(region("region2"), name="region2"),
    )
    layout["lower"].split_row(
        Layout(region("region3"), name="region3"),
        Layout(region("region4"), name="region4"),
    )

What I'd like to do is have 4 independent tasks run concurrently and each independently update their region. For instance:

    with Live(layout):
        ...
        from time import sleep
        for n in range(0, 100):
            layout["region1"].renderable.renderable.add_row(str(n))
            sleep(.1)
        ...

However, when I do this, only the first N rows are displayed. I'd like for the last N rows to be displayed per region instead.

Thoughts on how to easily accomplish this?