Accounts
Connecting, renaming, disconnecting, and what a re-authorisation is for.
Every Trading account on your Broker connections, with what it is worth, what it is holding, and whether it is protected.

Connecting another
Connect another runs the same cTrader round trip and returns here rather than into setup. Re-authorising an existing ID is the same button - grant the same accounts and everything carries on; grant fewer and the ones you left out stop being watched, which the page says out loud.
Renaming
A name is yours and local to Propcockpit. The mask stays whatever you call it, so a screenshot never carries a raw broker id.
Disconnecting, and removing
Disconnecting revokes the tokens. It does not delete your Protected accounts - they are disarmed, keeping their Initial capital, their rules and their history, so reconnecting picks them straight back up.
Removing an account entirely is a separate, deliberate act, and it checks first that the account is flat. If Propcockpit cannot see the account to check, it says so and asks you to accept that rather than deciding for you.
Re-authorisation required
The venue has stopped accepting the token. Only you can fix it, by signing in at cTrader again, and the card says so with the broker's own error code beside it. Nothing is being watched on that connection while it is in this state.
Open P&L
Each card shows what its own account is holding. A dash means the figure is not known - an account this process is not holding, or a position that cannot be priced right now - and it is deliberately not a zero, because on a page about risk those are opposite claims.