Be careful to use 'coin-control' no idea about that at all
Under Settings->Options->Display(tab) you can turn on coin control.
Once this is on, when you go to the "Send Coins" screen there's a button at the top marked "Inputs...". Clicking this opens a new window that lets you manually select the coin inputs to use in a transaction, otherwise it's done automatically (which could adversely affect your staking). It also lets you see your unstaked piles of coins in detail.
Thank you for the well written explanation......i didn't see anything about unstaked coins
As previously stated (thank you):
Coin control is a feature that can be turned on in the settings (settings -> options -> display).
It allows you to choose which output (pile) you send from.
This is important, as when you send a part of an output (pile) of coins, the entire pile loses any stored 'age' or weight.