In FactoryTalk View Studio, open the "Project Settings" window.
When you change from PanelView Plus 1500 (1024 x 768 ) to PanelView Plus 700/100 (800x600), the software will attempt to scale all the graphical objects and fonts so they fit on the smaller screen.
You'll see that it gives you options for what types of objects to scale, and reminds you that this cannot be un-done. Be sure to make a backup before you try this.
In my experience it's not perfect; some graphics and objects don't look very good after being scaled. But it's better than re-sizing everything manually.