Merge multiple blocks into one block

When I copy a mail from Gmail to logseq, logseq creates 6 blocks with this mail. One block per blank line.
How can you use a quick action to merge multiple blocks into 1 block?

ctrl-shift-v to paste might help

Yes, this works, as I wish. I should have known this, because this is special in other programs as well. Thanks very much for the quick response.