vtkCubeAxesActor2D (8.2.0), changing axis label font size (does not work)

Hi,

When I run CubeAxesActor2D example and change the font size from

tprop->SetFontSize(20);

to e.g.

tprop->SetFontSize(40);

the actual font size does not change.

Any idea why/how to change label font size?

Thank you.