For example:
For live sessions, you can simply start the live session before you begin your presentation, and then navigate to the screen you'd like to begin from. When it comes to on-demand sessions (including embedded demos), you have the option to specify the starting screen by appending the 'start screen' parameter to the demo URL. For more details, please refer to the 'Share demos' guide.
Step 1: Open up the Demo Details page
Step 2: Click on Share and copy the link.