Powerpoint presentation problems

Good morning! I have a serious problem with Jitsi Meet! I have the free version. Since yesterday I have not been able to share Powerpoint presentations during videoconferences. The Powerpoin file opens regularly from the “application window” but when I start the application presentation, the presentation starts on my pc but is not visible to other people participating in the videoconference. Others see only the open Powerpoint file and not my presentation. How can I do? This problem is causing me serious problems! Thanks for your timely help!