https://teenage.engineering/guides/op-1/original/tempo#10.8
I’m going off an OG-1
Press the metronome button, then turn green knob to PO Sync with the LINK text in red, then hold shift and turn the green knob again and it will change from PO SYNC to 1/16 SYNC.
I don’t have and eurorack to test this with, but I was reading the manual and remembered someone asking about this.
Hope it helps!