Axes label do not scaling righ when save the screenshot at higher resolution.

When I save the screenshot of the following results in a higher resolution, the font size of the axes label in the png file does not scaling.
This is the result in paraview

Note that the axes label font size on the right picture is double that on the left.

The double-resolution png is

The 4x resolution png is

Is this a bug or something else?

Presently you have to manually set the font size to bigger values.

BTW, the edge width does not scale either. But that can be solved by applying the tube filter to turn it into a 3d object.

As for automatical scaling, I could be wrong but I don’t think you can do that without hacking the source code for vtkGridAxes3DActor as well as text/plane actors used by it. The underlying properties are simply not fully exposed to the users.