You can download app called "SysApp Pusher"
Then launch it and it will give you access to the Glance Screen Settings. (and lots more)
I found it on a thread around here somewhere. Have my Glance Screen set just the way I want it now in 10512
True, this method shows Glance in the store as installed, with the option to "open" it, which in turn goes to the Glance settings screen. However, you have to use this method (use Sysapp pusher) each time, to get to these settings as it doesn't place the settings anywhere accessible in the actual settings menu.
I'm still hoping though, that they bring back the MSN weather app support for Glance like we had in 8.1. I kinda miss that.