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For some reason, the projects window can't be grouped with other windows like the files or runtime window. The minimize button also has disappeared. I did't find an IDE setting like with Eclipse ("Reset perspective"), to repair that.
Created attachment 37352 [details] screenshot of projects window as it is now and as it should be
I can't reproduce the issue, moreover you can easily DnD projects window to group it again with files and other windows. I guess this was some random bug which disappeared over time. However if you still experience the problem, please reopen with steps to reproduce, thank you.