Hello there! I am Charity, I'm an Independent Advisor. I'm glad to help you today!
Thank you for the information. You may use Presenter View.
Connect your laptop to the screen via HDMI.
In PowerPoint, enable Presenter View under the Slide Show tab.
Set the external display for the slideshow, while your laptop shows your speaker notes, slide previews, and timers.
You can easily switch between multiple presentations using Alt+Tab without disrupting the audience's view.
Please let me know if you have any more questions, I'll do my best to respond as soon as possible.
Kind Regards,
Charity
Please note that things might need more than one reply to completely resolve your issue, as it will completely depend on the complexity of the question and the amount of detail that you have provided me.