I played with pressing them open and to the side...
If you are pressing to the side and a seam feels bulky, then I repress them open.
As other's have mentioned, if there are going to be many seams in one area, it is best to press them all open...
Bearisgray has a PDA and she has shown a big variety of blocks that she has been working on. She shows the front and the back of them. You can really see from the back how and why she has pressed them as she did. It might benefit you to check this out... :wink: