Steps:
- Open developer tools
- Click on "Toggle device toolbar"
- Click on 3 dots in the top right corner
- Click on "Capture full size screenshot"
How to make Full-Page Screenshot with Chrome without an extension:
https://www.youtube.com/watch?v=r_6_9eFPhxI
Or you can do it via shortcut Cmd+Shift+P and then search "Screenshot".