I can't see all the columns to add to dashboard

[MiguelNYC]

Hi, I’m new at this. So this is probably very simple. I search in videos and documentation but I can’t figure it out myself.

When creating the Dashboard, and wanting to add the elements, only 3 options appear, but not the ones I want. What I am looking for is to measure the percentage of attendance, sort it by company, and by each boss of each company. (I have these columns in my Database)
About the three options that appears, I only have the first one in my database