To have a more accurate reflection of your holdings you can manage your cash.
You can manage cash in your cash screen, by following these steps:
After you add your first cash position, your cash will always be visible in your holdings dashboard.
Managing cash usually also includes increasing or reducing cash when transactions happen.
To automatically include a transaction into your cash balance, just activate the option "Add to Cash" for sell transactions or "Deduct from Cash" for buy transactions.