How to display multiple items in the same window
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Our IDEs will support opening projects as tabs in 2020.2.2 version of IntelliJ IDEA for macOS Big Sur. It will be published later this month. Here is the related YouTrack item: https://youtrack.jetbrains.com/issue/JBR-2893
Linux and Windows do not support this feature. Here is why:
We have a 'Module' entity. This is pretty the same as 'project' in Eclipse. So, you can open several modules within one project (File > New > Module from existing sources). This is working in the same way as several projects within one workspace. Here is the documentation page regarding that:
https://www.jetbrains.com/help/idea/migrating-from-eclipse-to-intellij-idea.html
You can add multiple modules to a project, but you can't have multiple IDEA projects opened at the same time in the same window. More details regarding that feature could be found on our YouTrack:
https://youtrack.jetbrains.com/issue/IDEABKL-6118
Here is the summary by our developer:
> Many UI elements in IntelliJ IDEA assumes that each project corresponds to a separate frame, so implementing this feature will require rewriting a lot of code in IntelliJ Platform. Currently, we don't plan to do that.