Make a rhythm feel different without making it messy
Swing and humanising are different ways of changing a rhythm. Swing gives alternating short notes a long-short feel. Humanising adds small differences to hits. Neither is an automatic way to make every pattern sound better.
Start with a pattern you can recognise
Use a short repeated drum part in Songwriter and keep a version or song-file backup. Begin at a moderate tempo with swing at zero. Listen to the spacing between hits, not only the speed of the song.
A straight pattern can be the right choice. You do not need to add unevenness simply because a control exists.
Compare a little swing with straight timing
In Songwriter's Drums editor, move Swing a small amount and choose whether it applies on eighths or sixteenths. Play the same passage, then return Swing to zero and compare.
Songwriter's Swing changes playback timing rather than moving the written notes on the grid. It is also a whole-song setting, so listen to the other parts before keeping it. A melody can feel different even when you were only looking at the drums.
Treat Humanise as an edit
Humanise changes the drum notes with small timing and loudness differences. Unlike returning a playback swing control to zero, reversing that generated edit calls for Undo or a retained version.
Try it once, compare with the original and avoid repeatedly applying it without listening. Random variation does not know where your singer wants a steady beat.
Separate feel from an actual timing fault
If an imported recording is consistently late or two DJ tracks drift apart, investigate that problem on its own. Swing is not microphone calibration, and humanising is not a repair for a wrong beat grid.
Melody timing and same BPM but out of time explain those different situations. A useful practice result is being able to say which version you prefer and why, even if your choice is the original straight pattern.