If I have tick labels like those in the picture, is there a nice way to express them in scientific notation and display the exponent e.g. at the top of the y-axis, with only the significands as tick labels? This would save a lot of space.
No automatic way, currently. You could make a tick formatting function that divides the numbers by your chosen value before turning them into strings, and then you add that value manually like Label(fig[1, 1, Left()], "some value", valign = :top).