Apple Macs run macOS and iPhones/iPads use iOS and iPadOS respectively. These are device-specific with very different operating systems and Pages implementations.
I am using Pages v14.1 on macOS Sonoma with a multi-page document open and using an Apple Magic Mouse II, I can slowly scroll from the end of one page to the beginning of the next without any abrupt transition. Using the Page Up/Down keys on my extended Apple Magic Keyboard does cause an abrupt transition between document pages.
Though I rarely use it, I have scroll bars shown on the open Pages document and even if I click and drag on the scrollbar, the transition between pages remains gradual.
Pages itself has no settings to control pagination scrolling behavior. If you are using macOS Sonoma 14.5, the System Settings > Appearance panel has a section on scroll behavior but I don't think that will resolve what you describe. On macOS Monterey (12.*) and earlier releases of macOS, the System Preferences > General panel has scroll settings — again, which may have limited use for your Pages issue.