@Rakesh Bhardwaj The “allow document page to shuffle” option in InDesign controls whether pages automatically rearrange themselves into spreads or stay independent. If you uncheck that option, you can create custom page spreads by manually positioning pages next to each other, which is useful for unusual layouts. In CC 2019, this setting is found in the Pages panel menu, so keep an eye on that when working with facing pages to avoid unexpected rearrangements.

@Rakesh Bhardwaj The “Allow Document Page Shuffle” setting in InDesign controls whether pages in a spread can move independently or must stay together as facing pages. When this is unchecked, you can create custom spreads with more control, which is useful for complex layouts like brochures. Just keep in mind that changing this setting after adding pages can cause unexpected rearrangements, so it’s best to set your document structure early in the design process.

I think “allow document page to shuffle” might control whether pages can be rearranged automatically when you add or remove pages. Maybe if it’s on, InDesign tries to keep pages in order like spreads, but if off, you can place pages side by side more freely? Not totally sure though, just guessing from how the name sounds.