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The src folder may not be visible in the project when using IntelliJ IDEA due to several reasons. Some common reasons are:

1. The project might not have been set up properly, and the src folder might not have been added to the project's source code folders.

2. The src folder may be hidden in the project view. To unhide the src folder, go to the project view and click on the gear icon. From there, select the 'Show Module Content' option to display the src folder.

3. There may be a filter applied to the project view that hides the src folder. To check this, click on the funnel icon in the project view and make sure that the 'src' option is selected.

4. The project may not have any Java source code files inside it. In this case, the src folder will not be visible until Java source code files are added to it.

To resolve this issue, check the project settings, ensure that the src folder is properly added and visible in the project view, and add Java source code files if necessary.