Using custom dimensions/Variables with Tag Manager

Hi, I’m trying to use Custom dimensions with Tagmanager but I don’t find a way to make it work.

I’m sending a variable named company like this

I’ve created the Variable like this

But I don’t find where I can see that information. I would like to filter actions or events by that “company” variable. Is that possible?

Have a look at this fantastic video: https://matomo.org/tag-manager-training/
(yes I reactivate this subject, because I searched a lot before knowing how to do: some things are in the Matomo configuration variable…)