Previewing notebook minimizes environment and console panes

rnotebook

#1

I'm working on an R notebook. When I save, the Viewer pane is updated automatically (good) but it also gets vertically maximized, which minimizes the Environment pane (bad, at least for me). Similarly the "main"(?) pane sometimes vertically maximizes when I save, which shrinks the Console, which I want to prevent.

Are there settings to prevent these panes from being auto-sized while keeping the auto-preview on save?

I'm on 1.2.1086 but got the same issue in 1.2.1013.

I'm an R newb, so here's a picture of my setup in case I've butchered terminology.