HDRP Package sample project is not under the specified folder hierarchy Assets > Samples. All the packages with sample projects should follow the folder hierarchy "Assets/Samples/Package Name/Version/Sample Name" according to "Package sample support" guideline doc. Refer the attached screenshot

Steps to reproduce:
1) Create a new project
2) Window > Package Manager
3) Install HDRP package
4) Import sample projects

Actual result: The sample project is imported under "Assets > HDRP sample content"

Expected result: The sample project is imported under the specified folder hierarchy "Assets/Samples/Package Name/Version/Sample Name"

Occurring in: 2020.1.0a10, 2019.3.0b10

Environment: Both Windows and Mac

Note: Procedural sky sample is imported in the right location whereas the other three samples are installed under "Assets > HDRP sample content"