Logic Pro - How do you change the grid units in the Piano Roll editor?

I currently have Logic Pro 10.7.7. In some previous version, I used to be able to change the grid display in the Piano Roll editor by clicking under the time signature in the info display at the top of the screen (that black, round-corner box that looks like an LCD screen). This was very useful when inputing tuplets by hand. Now the info display at the top has been changed and that feature seems to be gone. I couldn't find anything about changing the grid in the help or the online user guide. Does anyone know how to do it now?

Thanks.