Pencil issue

Hello, I recently started using Blender and today I started an animatic with the regular pencil, with sensitivity and transparency, but suddenly (I probably touched something by accident) the whole animatic became opaque and the pencil strokes were all the same size. Can I revert the drawings to normal or do I have to redo them completely? :/ And how can I go back to the regular pencil, please? (The image shows what it looks like now and of course I forgot to save it first)