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Hi aro albal
From the comparison, the previous interface appears to have allowed a quicker transition between Search results and the notebook structure, while the current experience requires returning to the navigation pane and reselecting the notebook, section, or page after using Search.
Based on Microsoft's documentation, Search results are displayed within the left navigation area, and notebooks, sections, and pages are accessed through the navigation pane. Microsoft also describes the refreshed OneNote layout as using collapsible navigation panes as part of the updated navigation experience.
At present, the available documentation does not describe an option to restore the earlier navigation behavior or bypass the current Search-to-navigation workflow. As a result, the behavior shown in the screenshots appears to be consistent with the current OneNote for Mac design rather than a configurable setting.
For users who frequently move between Search results and active notebooks, the additional navigation step may make the workflow less efficient compared to the previous interface. If you would like this experience to be reconsidered, you can submit feedback through Help > Feedback in OneNote. Feedback submitted through the application is routed to the OneNote product team for review.
I hope this information helps.