I am running my first ever grow x4 auto flowers orange sherbet from fast buds in 12L fabric pots have been performing LST since week 3 my question is when should LST be stopped or should it be stopped at all ... today is week 5 so signs of flowering has started I will introduce bloom nutrients

When the plants stop stretching around day 21 of flower is when most stop LST. I personally sometimes do supercropping to help maintain an even canopy so it doesn't have to just be LST for that.
Your neighbours plant looks whack, could it be male? or is that seed bags I see
Ignore the small plant on right that’s was given to me by neighbour who has not looked after it very well