A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
Hi Adam,
Thanks for posting your questions on this community.
According to your description, I did a test on my side, the test result shows that after you've recorded your PowerPoint for Office 365 presentation, the camera video you performed is saved on the individual slides, then you can adjust the size or location or apply it to other slides.
But there is no current option to change the default size and location in PowerPoint, you need to adjust them manually each time when you finished recording. We have a full understanding that it will bring more convenient if this feature can be achieved.
Therefore, if you have further concerns about this feature, we would suggest collecting your idea and suggestion to our UserVoice where the related team often takes good ideas. We will continue to make our products and services better.
Much appreciate for your understanding.
Have a nice day.
Best Regards,
Higgins