There are a lot of factors when it comes to removing all the white space. You really have to be a good detective to figure out exactly what it causing the issue. Here are some things to check:
- Make sure no groups are overlapping each other, stack them like Legos instead.
- Make sure there are no invisible elements on the screen causing overlapping issues.
- Make sure all groups checked to collapse when hidden.
- Look through your elements list to make sure there is nothing hiding underneath your elements causing the groups to not collapse.
Hope that helps a little bit, if you need some more help check out www.NoCodeMinute.com
Here is a video on collapsing all groups.