Too much margin whitespace

I assume this is due to having to accommodate the larger elements of the six dot menu and fatter arrows. Especially bad when using multiple vertical panes in a smallish vertical window, see image.


is that with the full page width option turned on under settings - interface?

Ironically, full page width makes it even worse. However, there is a snippet to ameliorate this somewhat - the 0px version of Less whitespace in the left margin.