When the blocks are pressed to the side, there is a definite seam ridge. I was taught to pull the block slightly apart so you see the seam line easily. Sew down the seam line so when you release, the stitches will disappear. (I'm not always that disciplined)
If the seam direction changes between blocks, it takes a little more tugging to align the seam with the stitch line. It does work but it is a little slow going.
I have also done a topstitch on top of the ridge - just at the edge. I like that look but it takes serious concentration.
You can do what you like and get the look that you like best. It may be different from quilt to quilt.