On any measure count on the step sequencer, you can do the following:
1) Tools > Quantize... > Quantize start time.
2) Tools > Snap > Snap to "main" or "cell"
3) Click on the tail end of the note (yung lalabas yung dalawang arrows), click to the left.
4) Tools > Quantize... > Quantize end time.
You can also double click on the selected note and look at the "start" and "duration" timers. Nandun lang yun. Yun lang yung mga numero na puwedeng galawin... hindi mo ma-mi-miss yun. Mas madali.
Also, as a practice, make different Pattern clips instead of putting all into one Pattern clip. Kung may 4-on-the-floor pattern ka sa drums tapos yung lead mo ay 8 o 16 bars, I think hindi maigi yun na nasa isang Pattern clip siya.