How can I have two modules in one project?
已回答

Like in this photo I got on youtube, a Getters and Setters Tutorial
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The answer was provided at https://intellij-support.jetbrains.com/hc/en-us/community/posts/360004321099-How-can-I-work-different-projects-in-the-same-window-?page=1#community_comment_360000640620.