Defining equilibrium in reactor

First, I am very sorry to bother you too many time these days.

I want to make one equilibrium reaction as you can see in the attached pic.

I could change the single reaction arrow to the equilibrium arrow. however, when I save, in the preview panel, the single arrow is back. even in the editing windows, it is apparently back. so it seems it cannot be changed.

Could you let me know about this matter?

Thank you very much for your help.

 

 

Hi,

The attached image shows that you used "graphical equilibrium arrow" (blue one). You should use the "black" equilibrium arrow in a reaction definition.

Best regards,
Viktoria