If you don't have the manual, get it
here.
Check page 98. Quantize is a Song function, not a Pattern function! It would seem that quantization after recording is only possible on the entire song, not on each pattern.
However, when recording patterns in real time there is a setting for resolution and from the manual wording this is a fixed quantization of your playing
during recording. In other words, if you set resolution to quarter notes and play eighth notes or shorter instead you should hear quarter notes on playback (try it). The setting of 1/48 of a quarter note is just the limit of the sequencer's resolution (48 parts per quarter note, often abbreviated 48ppqn). That is the setting you would use if you wanted no quantization at all. Step recording of patterns is quantized by default, of course, by setting the note length of each step.
OK, there is one workaround for already recorded patterns. Welcome to the joys of early MIDI sequencers, you get to do Event Editing! See p.103. You can edit each and every note in the pattern, and this would allow you to
manually quantize the pattern. I have in fact done this with some sequencers and it can be a dreary chore but that was what people did back in the day...or else they erased and rerecorded with a more appropriate resolution setting, so fewer edits would be needed later, maybe a few notes quantized improperly due to player error. Event editing is actually missing from some DAWs...Reason and Live don't have it. You literally have control of the individual MIDI messages, down to things like program changes, CCs, etc. With the M1's small display it's not pleasant, but it can be done.
My advice is to set the resolution for each pattern before recording. If you want 1/16 notes, then set resolution to /4 (quarter note divided by 4) for tight quantization or /8 (32nd notes) if you are willing to allow a little slop. Then edit any mistakes you hear on playback.
Good luck!
Here's a period video tutorial:
The "Creative Sequencing" discussion starts about 47 minutes in.
I listened to Hatfield and the North at Rainbow. They were very wonderful and they made my heart a prisoner.