Number of Pull Down Values Shown

Hello,

I just bought a new laptop but when I click on a Excel filter, the number of values in the pulldown menu is now 2, maybe 3.

Screenshot.PNG

The laptop has 3840 x 2160 resolution which is much better than my previous laptop which showed 7 or 8 values.

I'm using Office '16 64 bit on Windows 10 Professional.

Does anyone know what controls the number of values shown?

Cheers,

Ryan