Adjusting the grid division

I have driven myself mad with this! My grid in MPC beats is currently at default quarter notes. I want to adjust it to be 1/16th notes. I have searched and searched and cannot find how to adjust the grid division. I accidentally did it one day with some keyboard shortcut I think but cannot reproduce results. I would be so grateful if someone could tell me how to adjust the grid division?

Use T.C. (Time Correct) for this. It is connected to Note Repeat, both share the same timing, and it is mirrored into the visual grid.

Thank you!!!!!