Spacing between posts
Posts on the same platform go out at least 45 minutes apart, at natural-looking times EverySqueeze plans for you.
EverySqueeze spaces your posts out for you. Posts on the same platform are at least 45 minutes apart — the gap it plans is between 45 and 90 minutes, at a natural-looking minute inside your posting hours rather than on the hour. Posts to different platforms are also kept a few minutes apart, so they never go out at the same minute. Settings → Posting schedule says so: "Posts on the same platform are at least 45 minutes apart."
There is nothing to set: the gap is planned, not a dial. A batch of queued posts is spread across the day, and across later days when your posting hours or daily limit are full, so they never go out in a burst.
If a post is due before its platform's gap has passed, it waits and goes out when the gap clears; its wait reason says it is spacing out your posts. See Why a post hasn't gone out.
Older schedule
A workspace still on the older schedule has a "Minimum gap between posts" dial in Settings → Posting schedule instead (No gap up to 12 hours, per platform), and only spaces posts on the same platform.