'How can I see multiple tabs in IntelliJ?

The situation is when I open some files it isn't added on editor tab(red box). The file that I double-clicked is located in green box with replacing existing file.

problem on editor tab in intellij

I want to see multiple tabs in editor tab in IntelliJ. But I can see just only one tab like below.

I try to look around settings - Editor - General - Editor tab. But I couldn't find answer.

I wish I could get a hint here. Thank you.



Solution 1:[1]

Click on gear on the right -> view options -> Open in a new tab

Sources

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Source: Stack Overflow

Solution Source
Solution 1 José Miguel Olavarría