Aim: I want to be able to change the footer of a presentation (e.g. the name of the presentation or the name of the speaker). I do not want to edit each single slide on its own.
Procedure: I would imagine this should be possible using the slide master. And indeed: adding for example a logo to the slide master (tab View --> Slide master) will include it on all existing slides.
Problem: Each time I change the header or footer in the slide master, nothing happens to the existing slides. Of course, all new slides now include the header and footer, but not the old ones. What could be the reason for this? Is there any way to "push" the new format.
Bad workaround: One way of solving that is to create new slides and then copy all text content from the old slides over. That is not very effective, however...copying everything by hand is an unattractive task.