The D7 figure can be played in different ways with the Cuatro by making use of either the bar or applying all fingers to the corresponding frets. The D7 chord in itself consists of marking only 1 fret and is another very simple chord to play by using the index finger.
Moving along the fretboard to other chords, we can see how we can make use of either the bar or the remaining fingers to mark the chords. When marking the chord without the bar, the order of the fingers used from top to bottom is index, middle, ring and pinky. This is the natural order that your fingers follow.
Here we see the F#7 u0026amp; A7 being marked in two different ways. Depending on what chord you need to play next or what variations you would like to use will determine how you play these chords. Ideally, if you are planning on moving up the fret in the direction of the neck, then you would play using all of the fingers (one per fret). If you are planning on adding additional notes or simply moving down the fretboard, then you are probably better off making use of the bar with your index finger and middle finger which liberates the remaining fingers to play variations.
Playing this chord with all of the fingers has certain benefits to it. For example, there are many cases when we would switch from the seventh chord to a 6th minor. In the example below, we demonstrate E Minor 6 and by making use of all of the fingers to mark this chord and the 7th chords, it makes the change between the two a lot more comfortable and flowing.