PDF viewer: Add a "Collapse All" Button for the Table of Contents

[Max_p]

Navigating through a long table of contents in a PDF can be challenging, especially when there are numerous chapters and subchapters that are all expanded. It would greatly improve the user experience if there were a "Collapse All" button that allows users to close all sections with a single click. This would make it easier to navigate by letting users manually expand only the chapters they need, providing a cleaner and more manageable overview.

[Jon]

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