Thanks for keeping in touch with us. I hope you’ve been doing well.
I’m going to ask that you attempt to update the theme as soon as possible. I’m currently using v2.6.4 and I’m seeing this option. Apart from a conflicting plugin, I’m not sure of any other reason why you wouldn’t be seeing this option.
I’m going to advise that you to first, disable all your plugins, check to see if the option is still not present, if it is, then re-enable your plugins one by one to see which plugin causes the issue.
If the issue isn’t with your plugins then you may want to update. 🙂
I hope this helps.