Screen sharing - Page issue

Dear All,
while sharing sharing screen, its working perfectly fine. only problem is, when sharing any windows / App its showing only that page to other party.
example, when sharing PPT with 10 page, only first page showing to everyone, however i am scrolling, which is not reflecting to other people. they can only show first page.
however, if i share PDF, its working pefectly fine. other peope can see all pages even scrolling page is workign file.

any clue ?

running vesion is Nextcloud 16