I think how the blockchain.com wallet works is that every time you use an address to receive  find, the wallet automatically creates a new and unique address that is also linked to your private key wallet. It doesn’t repeat the same address, but you can also decide to continue making use of that particular address that you have used to receive funds.

Although you have to know is that the reason why they changing the address and giving you a new and unique one is for added security. And of course you can use the addresses, but using them permanently means that every funds goes to the address and can easily be traced. It’s usually best when you’re steady changing the address. But it is still up to you on whatever you want to do and how you want it.