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I made two user templates.
Working during building the presentation with user template no. 1 and get further in presentation details. so now i see i want to use for e.g. a smaller font size in my footer.
So then i made these changes in my user template no. 2 and assign this user template to all of my slides. Works like a master page or master layout in Indesign for e.g..
So i can define different user templates and can change them when finishing or working on a presentation.