Woazathatt51 Should you have a Swiss Travel Pass, then simply taking a RE9 or R19 train instead of the PE would be fully included with your pass, and reservations are not even possible on those.
Those “non panoramic” trains would just have the regular size windows and would approximatively look like this or this. However in some coaches as in those pictures, the windows can be opened, which allows better quality photos without the window glare / reflections you’d get in the PE.