Visible warp threads

How do you weave a piece so that the warp threads aren’t visible? From what I see on this subreddit, it looks like everyone has perhaps a much tighter weave. Photos are from a frame loom btw. UPDATE: I solved the issue unexpectedly. I bought a nicer comb and am now getting a much tighter beat. The rows of weft have really compressed and I can no longer see any warp. My advice, if you got a little loom kit, ditch the comb immediately.