Pluto get the size of output pane/field/cell

Is there some way to programatically get the size of the output panes/field/cell (sorry, dont know the right term, hopefully it is clear from the context below) in Pluto, for example inside a show method?

Use case is that Im plotting a bunch of subplots and would like to make efficient usage of the space without having scrollbars appearing.

I tried displaysize(io) but the numbers don’t seem to match the cells.