Note that you do not need an active subscription to Microsoft in order to access PowerPoint. You simply need a free Microsoft account and log into OneDrive to access this PowerPoint version.
1) Start by hiding the image thumbnails on the left:
2) Click on the arrow in the right-hand corner to deploy the drop-down menu. Once there, check the "Single Line Ribbon" and the "Automatically Hide"
3) You are now ready to record!