Hello kerry Cha
Good day…
There is neither a YES nor a NO.
First of all, Glacier Express does not have its specific tickets. It is simply a ticket that is simply valid for that route.
Whether you can use it for another route depends on the ticket type. If its title reads point-to-point ticket, the answer is NO. If it reads, Saver Day Pass, the answer is YES.
If you want a distinct answer, please share more details on your ticket yet refrain from posting a picture or screenshot.
Kind regards,
Roland