Tree Panel reduction

Could it be possible to reduce the tree panel?
I work mainly with my handy, but small MacBook Air 11" and I have to reduce to 70% the view to be able to see fully the page I’m working on.

Hi Phil,

Unfortunately, it is not possible to hide the tree panel. I find it very useful and use it every single moment, but I understand that on small display sizes, it is very difficult to work with Blocs 3. I have a 12-inch MacBook and I have the same issue.