Yes, you can change the white space between content blocks! It takes a little tinkering, but it's very easy to change the white space a.k.a "Default Block Spacing".
Go to the content block (frame) on the page where you want to change the white area between blocks.
Click the gear in the upper left of the content block:
Next you'll see Block Setting. Scroll down the menu on the right until you see Default Block Spacing. Ensure the button is deselected. From there you can slide the button back and forth to change the padding on the top and bottom of the content blocks. Keep in mind that all content blocks have top and bottom padding. you don't need to change the spacing in all the content blocks, but you'll want to try to be consistent with the padding on the page.
Click "Save Changes" at the bottom of the box.
View your content block and page to see if the spacing is what you need. If not, go to step 3 and play around with the top and bottom padding. Remember to click "Save Changes".