If you have many applications on your workspace and have a small screen (for example a 13″ laptop), then there are chances everything don’t fit properly into the available space. A bit like this:

If you want to get rid of the scrollbar and have something clean, you just have to click on the top right menu and adjust the “Block size” option. You’ll get a more comfortable place to work:

 That’s it! Two clicks and everything now fits properly on the screen!