This answer is only for the the Fieldmaps app's Fieldmaps Designer (so I don't think it answers OP's question but it solved my similar problem and may be useful for others who found this question by googling): Go to Fieldmaps Designer > Open your map > App settings > Collection > near the bottom there is a slider "Snapping: Snapping centers the location target on a point or vertex of a nearby feature." > turn that slider off.