Positions
The blotter, closing part of a position, managing one, and the two kinds of position Propcockpit did not open.

The blotter
Every open position with its size, entry, stop, target and live P&L, and a net figure above them. In the Terminal, click a row - anywhere on it - to manage it, and right-click does the same. On the Positions page, Modify opens the position in the Terminal's ticket.
Closing
In the Terminal, Close asks how much and defaults to all of it. A partial close leaves the rest running with its stop where it was. On the Positions page, Close closes the whole position at once.
Managing
The ticket's Manage tab changes a position that is already open: move the stop, set or move a target, move the stop to breakeven in one press, arm a bar-close level inside the stop, or switch on a broker-side trailing stop. The last two are Pro capabilities, and live in Pro detail.
A stop loss can be moved and can never be cleared. The protocol has no way to express removing one, which is deliberate: a screen that could drop a stop by leaving a field empty would eventually do it by accident.
External positions
A position on a Protected account that Propcockpit did not open - one you placed in a cTrader app, say. It is priced and counted against your limits like any other, because the risk engine sees the whole account. What is different is that nothing checked it on its way to the broker.
Unprotected positions
A position with no stop loss. Its risk cannot be put on a number, so Propcockpit never invents one - and while one is open, new orders are blocked on Starter, Pro and Premium and during a trial, because there is no honest Buffer to check them against. The blotter marks it, and setting a stop from the Manage tab keeps working under a Lock and on a stale feed, for the obvious reason.