How to make symbols to be transparent?

[somethinghost]

Changing attributes wasn't help.

Edited October 6, 2023 by somethinghost

[rDesign]

1) On that Edit Texture pane, click on 'Edit...' next to Transparency.

2) On the next dialog window that opens up to Edit Image Mask, change the Opacity (%) from 100% to 50% or whatever you want. 

[Pat Stanford]

@rDesign has given you the steps. I will try and give you the reasoning.

 

Attributes are primarily for 2D objects.  Pen and Fill color will also apply to 3D objects, but Opacity is strictly 2D.

 

So if you want a 3D object to show transparent/translucent you will have to do something to the texture.

 

If you are defining textures of objects By Class, then you can duplicate the texture and set it to use transparency as shown above and then use Viewport Class Overrides to apply it to the appropriate classes.