1. In the store, click three, as shown below. Before switching, first connect the mobile phone network to the country you want to switch to, such as Japan, and then the network must be connected to Japan. Because it is judged according to IP, it cannot be switched without connection.

2. Next, you need to click the account, as shown below.

3. Next, you need to click account preferences, as shown below.

4. Click Add Credit Card or Debit Card, as shown in the figure below.

5. Click "Continue" to switch your country to Japan.

6. The effect after switching is as follows: The shops are all in Japan. Note that it can only be changed once a year, officially.