I am unable to find that option in Visual Studio 2017. I know you can change the font of the code you're writing but not seeing the option for IntelliSense makes me think that is not possible.

I am unable to find that option in Visual Studio 2017. I know you can change the font of the code you're writing but not seeing the option for IntelliSense makes me think that is not possible.

Tools – Options – Environment - Fonts and Colors > Statement Completion
you can change size as you wish there.