How Is the Layout Applied?
The layout styles are applied hierarchically starting at the Session.

You can let all your Destination screens adopt the Session's values.

In this picture, destination PRO_MAINT is using the session's inherited layout and dimensions:

The screen looks like this:

If we make the panel smaller, it looks like this:

If we override the layout to Flow and size the screen as above, it will look like this:

If we resize it to make it smaller, the size of the contents of the screen are reduced to fit: