Myeclipse_ cannot create a child package under a package

background
Create a Web project with MyEclipse. In the SRC directory, a package is created that wants to create a child package under the package. The results are as follows:

Solution Solutions

CTRL+F10 equals 1, 2/33 Step

1. Click on the item (as long as you have clicked on a column to create the item).
2. Click on the Window (window) option to locate navigation (navigation) and click.
3. Locate the show View Menu and click. If you see this option is grayed out, it means you didn't do the first step.
4. A new window appears, placing the mouse over the package presentation option, you will see two sub-options. 
5. The sub-option is flat, which represents parallelism. The sub-option hierachial represents the rating (choose this).

Note: After the setup is over, I still can't create the sub-package under SRC under the Web, then check the data to find that SRC will default to parallel packets. However, under SRC, you can create a source Folder and then create a child package underneath it.

SOURCE folder:
The folder that holds the Java source code, and of course includes some package folders, and can contain other files as well.
After the project is built, the Java in the source folder is automatically compiled into a class file into the corresponding Bin folder, and the other files are moved to the appropriate directory.