Yes. Simply, send coins from those addresses to your "main" address. You can spend coins from a specific address by enabling "Addresses" tab in the "View" tab, right-clicking the address in the "Addresses" tab and selecting "Spend". You can spend coins from multiple addresses at once. Before right-clicking any address, hold control and use LMB to select those addresses. It might be a better idea to use your Master Public Key to track all of your addresses. You will avoid paying for unnecessary transactions this way.
I'm using electrum in linux ubuntu, the funded addresses that I want to make as a main address has type "change". I hold ctrl key, but nothing happened. What is LMB? How to use Master Public Key to track all the addresses?
You need to be more specific. What do you mean by "the ledger showed"? Was it in Electrum or Ledger Live?
I'm using Electrum. I use term ledger for transactions in the Electrum history tab. The balance there is not tally to the balance shown down left corner. When I looked at the blockchain explorer, 18mbtc amount is both in confirmed received and spent. However Electrum add that amount to the balance history. Why?