Very small snap/referencing points

My snap and referencing points in sketch up pro 2016 are incredible small, which results that I have to zoom in like an idiot every time I need to snap or reference a point. I have colleagues with the same software and computer (MacBook pro 15" retina) were the points are much bigger. I’ve tried to change te resolution but it doesn’t seem to work… basically I need help! Many many thanks!