1. Start BitcoinABC wallet: `./src/qt/bitcoin-qt -regtest`
2. Enable the check named `Enable coin control features`, at Settings -> Options -> Wallet.
3. Go to Send dialog.
4. Enable the check `Custom change address` and fill with one address at the right.
5. Click on `Clear all` button.
6. Verify that the checkbox and the `Custom change address` text are cleaned.