It would have been better to ask in the PowerPoint forum, this one is for Word.
But I believe the following can work.
If you want to globally remove slide transitions:
- Go to Slide Sorter
- Hit Ctrl a (to select all slides)
- Right click any of the slides
- Select Slide Transition (task bar will appear)
- Select "No Transition"
- Click "Apply to All Slides"
Hope this helps
DeanH