Stetup for posts using less wasted space.

1) Click on 3 dots on far right of URL line. Lower the zoom level to smallest size you can still read.

2) Under you ID choose setup. Go through every choice under layout etc. You can change the number of items showing per page. I changed mine to 30. Default was 15. 

In the end you will find less waisted space between post and replies. This has worked for me.