Toolbar Icons in color?

I recently watched a YouTube video on DT3, and the presenter had icons on her toolbar that are a lot more colorful and identifiable than the simple stick figures I’m seeing. Mine are mostly white lines on a grey background (in dark mode) or black lines on a white background (in light mode.) Because they all look so similar, I’m having to use icons + text, which is a space hog on the toolbar.

You are likely looking at a video on DEVONthink 2.x.