Which all roles have view permission on that page?
Check if Guest role is having view permission. If yes then any user will be able to see that page so uncheck that.
Make sure the user with whom you are trying to access the page is not the creator of the page. If he is the creator, he becomes Owner of the page and by default has view permission on that page.
Make sure the user is not the member of the Organization or Community in which the page is there. Organization/Community member have by default view permission on their respective org and community pages. You have to remove the view permission of Organization/Community member role if that is the scenario. This will revoke view permission from all the members of Org/Community
Regards,
Sandeep
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