Open in new Window -> new process?
Answered
When opening another project in a new window, it seems that the same idea64.exe is re-used. Is there a way to launch a fully independent IntelliJ instance in a new idea64.exe process?
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There is no automated way to do it. To run multiple IDE instances you will have to make them run using different config/system/plugin folders via idea.properties modification (https://intellij-support.jetbrains.com/hc/articles/206544519, https://intellij-support.jetbrains.com/hc/articles/207240985). These folders are locked exclusively to prevent file corruption, so multiple IDE instances cannot share them.