Swiping through stacks easy on mobile, UI interaction hard to find on 4k screen, the bottom of the screen scrollbar is tiny, may want to address this.
You should open one bug per issue so this can be addressed properly in the bug tracker: https://github.com/nextcloud/deck/issues/new?template=Bug_report.md
Please search for existing issues before opening new one, because there might be already open issues like for this scrolling problems: https://github.com/nextcloud/deck/issues/1960