[Gmsh] How can I adjust the Z axis coordinate ratio inGUI

[zhoujun]

Dear Professor,

Sorry for my poor English.
I am new to Gmsh. I want to generate a 3D graphical file,say soundboard.geo 
by using Gmsh GUI.,since the ratio of the length to the thickness of the 
soundboard is about 150:1.How can I draw the geometry by adjusting the ratio 
value of X:Y:Z,so that I can see a visual result.

I am using V1.58 now.
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