Go to Edit > Preferences > General, and check Treat jpg files next to raw files as separate photos.
thank you, I changed it, so now I have to import all the memory cards again to get the jpeg files?
I never shoot or import jpgs, so I am not sure how this works.
It could be that the jpgs have been stacked with the raw files, in which case you can see the number 2 in the top left corner of the thumbnail.
You can then right click, and choose Stacking > Unstack.
If this is not the case, someone more knowlegdeable than me will have to help you ...
No, that doesn't happen. The JPEG images will have to be imported.