Actually Axis title can move only on his specific axis.
For example, x-axis title can move left to right and y-axis title can move up to down.
But in same cases, like mine, where the axis are not on the edge of the chart (because it involves negative x and y values and the intersection is in the middle of the field) it is necessary to move the x-axis title up and down to be next to the x-axis position, or to move y-axis left/right to be next to the y-axis position.
Feature request: allow axis titles to be moved on both axis and not only one.
In attach you'll find a screen that shows the desired result.
Best regards