All columns aren't showing up for Grouping in Reports

LDP ✭✭
edited 06/23/23 in Smartsheet Basics

I'm pretty new to Smartsheet and can't figure out what I am doing wrong here. I am trying to Group by the "PM" column but it's not showing up in the list. It's formatted as a dropdown, but other columns that are appearing on the list are formatted the same way.

What am I doing wrong?


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