In Chrome, your browser window may be too zoomed in & you will not be able to see the entire Main Menu. This is also dependent on your screen size.
What you can do in this instance is to hold in control on your keyboard and scroll with the scroll wheel on your mouse.
(CTRL + Scroll Wheel on Mouse)
Alternatively, you can click on the 3 dots in the top right of your browser window and use the plus and minus icons to zoom out as necessary, until you can see the full menu.