If you have a partially-threaded hole or feature in a sectioned or break out view, the bottom thread line is drawn over all parts in front of the threaded feature instead of being obscured by the parts in front of the thread feature. Right-clicking and turning off the visibility of this line turns off the entire thread line, even the part that is not obscured by other parts. At the very least, add the option of turning off just the part of the line that is behind any parts in the sectioned view.