Head to your 'Pending Bets' section and click on the green cash out symbol. Click 'Full cashout' and then 'confirm'. The funds should go straight into your available balance.
Why has my cashout value changed?
How to Cash Out step by step...
Head to your 'Pending Bets' section within the PointsBet App, and locate the bet you wish to Cash Out.
Click on the green Cash Out symbol.
A grey box will drop down with FULL CASHOUT - $AMOUNT. Click on it to proceed.
Click the big green CONFIRM section to finalise your cash out.
You should now see the Cash Out value reflect in your account balance as well as your Settled Bets.