Master mixer strip too wide now

In v5 the master mixer strip seems to be much fatter - is there a way to make it slimmer - I don't know why it needs to be so much wider than normal mixer strips. Also is there a way to stop automation tracks getting bigger when I resize the midi track? I only want to see the whole midi track, when all automation tracks resize with it I end up with a screen full of clutter.

Everybody needs a fat master ;) More seriously though, under preferences/theme/master, you have like 10 different master layouts .. enjoy :)

Can't see an item under preferences called themes? Is this a different name on Windows?

View, Screensets/Layouts, Layouts tab, Master mixer panel.

Thanks - I can see 4 there but none of them substantially reduce the width.

Sorry I forgot I'd switched back to the 4 theme - small isn't there for that. Yes I see it now, thanks. What's the session mixer for? It seems very different from the other layouts. Oh and is there a way to change track size without changing automation track sizes as well?