I don't know whether you are new here or you are new to Bitcoin wallet and how it works.

As far as I know the question you ask is public and often submitted by beginners, yes is common, embarrassed to ask heretics on the road, maybe you are lazy to find topics like this:
1. Topic: Electrum and change addresses
2. Topic: HD wallets and change addresses
3. Topic: Paper wallets and change addresses. Please help me understand a warning

And many other topics, that's an example.

However, you don't need to worry about it, you will find the answer in detail below, I hope to help you as a whole.

Please read: Can the cryptocurrency address linked to a wallet be changed? If so, what is the process for changing it?]/url]