Spacing is 1.5 lines but result doesn't look right

[luca9944]

Hi there, I'm working on my thesis. Prof wants 1.5 lines spacing, but the result doesn't look right. It looks like a lot more. What am I getting wrong? Here are some screenshots:


Thank you for your help!

 

[Stain Briganza]

Just see this image, you can understand how to give line space of 1.5