Thank you so much for your reply,
In my case, all elements have the same direction only when I use the mesher of the prepost but, when I use prepost to mesh a STEP file made on Solidworks, they tend to have different directions. Do you maybe know what causes this problem?
And if I am working on an orthotropic material, does that mean that I indeed have to modify all elements so that they all have the same direction?
Also, the material direction doesn’t appear to show for me like your second picture even when I define a coordinate system and refer to it in AOPT in the material keyword. I have read somewhere that I have to load an input deck first in order to show the material direction. Is that correct? What is an input deck and how can I load it?