Step 1: Understanding the Concept:
LibreOffice Impress is a presentation software. When you start a new presentation, it opens with a default slide layout.
Step 2: Detailed Explanation:
The very first slide in a new LibreOffice Impress presentation uses the ``Title Slide'' layout.
By default, the Title Slide layout contains exactly two placeholders (text boxes):
1. One for the Title (``Click to add title'').
2. One for the Subtitle (``Click to add text'').
Step 3: Final Answer:
The first slide has 2 textboxes by default.