The Workaround is to set up a new portfolio. “Short Sales”. In the new portfolio you only enter your short sales as if they were “buys”, and when you close the position, it’s a “Sell”, even though in reality it’s the exact opposite.
So in the end, you will have two portfolios, your “long - only” portfolio and your “short only” portfolio. You just have to remember that in the short portfolio everything is the opposite of what you entered.