is it possible to programatically change the width of Playground/Inspector panes?

Currently if I want one pane bigger I have to resize both which wastes a lot of space (I need to resize twice as much).

eg:

I wouldn't mind having a "special playground" just for this particular use case. There is also Roassal Easel 

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However I would like to have the code on a side rather than underneath because code is tall, not wide.

Thanks,

Peter
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