Hello Okular team,

I would like to suggest a new feature for Okular: a **“Hide All” option** to quickly hide all annotations, comments, highlights, and handwriting notes in a PDF.

**Use case:**

* I often use Okular on a **touchscreen or interactive whiteboard** without a keyboard.
* Currently, each annotation must be hidden **one by one**, which is time-consuming and inconvenient.
* A single **Hide All button** would allow users to instantly hide all notes while keeping the PDF content visible.

**Benefits:**

* Improves workflow for teachers, students, and presenters using interactive displays.
* Makes reviewing and reading PDFs faster and easier.

Thank you for considering this feature!