Yes, it is. But this option only works with the files uploaded to Storage so this wouldn't work if you are sharing your slides through a Share Screen option.
In order for this to work, you would need to enable a Picture-in-Picture mode. Here's how:
- Activate Audio & Video
- Choose the expand Video option
- Change the room layout (content only - see screenshot)
- Activate your presentation (PowerPoint or any other), click on a + sign and choose Storage option then select file that you want to presenter.