Can I make cursor-point suggestion window longer/bigger?

The cursor-point pop-up with suggestions as you type is not long enough to allow me to distinguish the options.

I may have 17 options, but I only see the 1st word of each, so it's useless.

Not sure whether this is because I'm using a relatively new computer with a hi-res screen (you'd think the effect would be the reverse).

Can I adjust this? It's my favorite function, but I effectively can't use it.