Humanistic and Software themes?

I noticed in the docs it talks about 'themes' -- and I saw that there is humanistic/software css files deployed with Radzen...when I change to them I get no visual changes (admittedly just using tabs/datagrid right now)...

Is there better documentation on themes or should these be having a visual change?

Themes do have a visual change (text color, button styles etc):

Got it. The changes between humanistic/software/default for tab/datagrid are too subtle and i didn't notice...especially because i wanted to override some colors.

thanks for your information