Apologies for the inconvenience. We are in the process of updating our website's design, which might affect how it appears depending on the size and resolution of your screen.
Could you please specify the page where you're experiencing issues, and also provide the dimensions of your screen in pixels (width by height)?
We are going to change our setting to try to fix this one.
P.S.: As a temporary workaround, you might find that adjusting the zoom level on your browser (using CTRL -/+ keys) could restore visibility to the index.