The Default query in backlinks plugin allows users to customize the default navigation of backlinks in Obsidian. It helps set a default search query, including options to collapse results, show more context, and sort the order of backlinks. The plugin also provides the ability to remember the display configuration of the backlinks panel for each file. This enhances the efficiency of working with backlinks by eliminating the need for manual input of search queries, especially when filtering out specific notes like daily logs. The plugin is perfect for users looking to streamline their backlink navigation and avoid clutter in their workspace.