reduce the sidebar height when no portal is selected - more useful now that the portal details now have a 'X' close button
could perhaps reduce the hight further, but then the expand/colapse arrow gets a bit cramped towards the top (could look into centering this vertically though..?)

also, moved the default right position of the sidebartoggle to offscreen. it's set in code anyway, and will look nicer on mobile app initialisation