Click on a chord and in the Chord Circle’s top right side, there’s a red “7-5” chord color button. That will produce a Dm diminished 7 chord (Dm7♭5): D F A♭ C

Also – if you press the “Details” button in the Chord Wheel, you can edit the individual colorations of the chord. For example – add an 11th, change the bass note, change inversions etc 🙂

Some of the buttons in the Details pane has a small black triangle in the bottom right corner – that means that you can press that button for a while to get more options. Pressing the “5” button enables you to change it to -5 (♭5), or +5 (#5).

The red buttons are presets of different combinations of the buttons in the Details pane. The red Sus4 will for example enable the 11 and disable the 3.

I hope this clears things up a bit!