You can use a highlight tool in the Monosnap Editor. The highlight tool marks essential parts of the text with the current color.
1️⃣ In the Monosnap editor window, select a current color and thickness
2️⃣ Select the Pen / Brush tool
3️⃣ Draw and hold ⌘ (macOS) / Alt (OS Windows) to highlight
📌 All screenshots and GIF were created via the Monosnap app for this guide 😇