Ask Siri to read the text on the screen

EXACT !

For my iPad, the choice to make within Accessibility is called "spoken content".

What I had not guessed was that you have to make a text selection, whereas I thought it was the content of the screen that you can see.

Then the same option as for a simple word that proposes

"Copy, look up, speak, or share"

works for the whole selection.

Fantastic,

Thank you so much