The default HDR images can be found in your installation folder:
- [Windows] -
C:\Program Files\Blender Foundation\Blender <version>\<version>\Datafiles\Studiolights\World\
- [MacOS] -
/Applications/Blender/Contents/Resources/<version>/Datafiles/Studiolights/World/
- [Linux] -
/opt/Blender <version>/<version>/Datafiles/Studiolights/World/
or/usr/share/blender/<version>/datafiles/studiolights/world/
In the World section, set the surface type to Background and the Color to use Environment Texture. Then select the HDR image you would like to use: