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I would like to extrude & scale the outter edge of my letter like this :
but Actually it looks like this ...
I have no clue how to do it ...
Also there is another problem, if I scale a mesh is there a way to deactivate the z axis ?
To deactivate $Z$ you can scale pressing S followed by Shift + Z.
$X$ and $Y$ will still scale.
Also the transform panel have little lock icons that you can toggle to lock different properties (like $Z$ scale).
I'm not 100% sure, but you can try Alt + S to scale along normals.
For the text you can use the offset value: