I would like to suggest a small but highly useful improvement for a future update of InDesign.

Currently, when guides are placed within a single page, there is no built-in way to convert them into spread guides (guides that span across the entire spread), unless they are re-created manually while holding Ctrl/Cmd during placement. This becomes especially frustrating when a layout contains a large number of precisely positioned guides that need to be extended to the full spread — for example, after a reorganization of pages or when switching from single-page to spread layout.

Feature suggestion:
Please consider adding an option to convert selected page guides into spread guides directly — either via right-click context menu (Convert to Spread Guide) or through a menu item under Layout > Guides.

This small addition would greatly improve workflow efficiency and reduce repetitive manual adjustments in guide-heavy documents, particularly for designers working on magazines, catalogs, or editorial layouts.

Thank you for your continued development of InDesign and for listening to user feedback.

Kind regards