How are which notes are on which strings in a scale determined?

Hi all; I was learning a D pentatonic minor and when looking at the scale pattern a question rose in my head, and a google search failed to find the answer. Let us use the D minor in a vertical pattern starting from the 3rd and ending on the 13th, which would be, from low E to high E:

Low E: G/A/C // A: D/F // D: G/A/C // G: D (?) // B: F/G/A // E: C/D/F

Low E: 3/5/8 // A: 5/8 // D: 5/7/10 // G: 7 (why not F on 10?) // B: 6/8/10 // E: 8/10/13

My question is in regards to the D on the G string, why not play the F on the G string also instead of just the D? So G: D/F // B: G/A. I noticed if playing just up and down the scale between the 3rd and 7th the G once again only has a single note, C. Why is this and how is it determined?

Thanks for your time.

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