The Position Log screen tells you the status of the positions of your Stocks/Scrips. The screen shows you the scrips that you hold and what is their status in terms of profit or loss. It shows you how much profit or loss you're making in terms of the current trading quantity.
Under the Positions widget, you'll see the the name of the scrip (A), the quantity you have traded in the scrip(B), the quantity of the scrip that was purchased in the first place, how much of it was sold off and what is the unrealized loss or profit that you're making since the beginning of the day (C).
Watch the below video to understand more about positions in your Upstox account portfolio.