retail CBDC is central bank money, so converting bank deposits into digital Euro changes the composition of the monetary base - fewer commercial bank reserves at the central bank, more central bank CBDC liabilities
retail CBDC conversions settle in reserves
ECB plans to limit the amount of digital Euro CBDC a wallet can hold
this means you will be limited the amount of digital EUR you can own
this applies only to retail European Central Bank CBDC, not wholesale. the idea is to prevent excessive outflows of deposits from banks