eclipse multiple projects in one folder

There is an inverted triangle table icon button on the right side of the top of the Package Explorer
1. Click the inverted triangle -> Top Level Elements -> Working Set
At this time, you will find that many projects will be automatically included in a folder, the name of this folder is other Projects , which is the default.
2. If you want to create your own folder,
click the inverted triangle -> Configure Working Set, a pop-up box will appear.
After the pop-up box appears, click the New button to create a folder.
In this interface, double-click a folder, it will enter the editing interface, you can modify the name of the folder, you can also choose to place
the item in this directory. To delete, select remove.