How to fix “Transaction too large” error when sending coins
You can refer to this method: https://coinguides.org/transaction-too-large-error-fix
Key points (Fix 1): Merge Transactions
Merge all small inputs into larger inputs, then send them to other addresses.
1. Open the wallet. Go to “Settings” >> “Options,” enable the “Coin Control” feature under the “Wallet” option, and then restart the wallet.
2. After opening the wallet program, click “Send,” then “Inputs,” select all small inputs, and send them to the other address you own. If you receive a “transaction too large” error, merge fewer inputs and send again.
