Hi both - & many thanks for your feedbacks!
As it is the first issue - only having power & pspice symbols - was due to what you suggested Rene… I did hit the hot key “p” and it obviously would open up power symbols. In my previous installation of KiCAD I had changed the hotkeys to reflect the keys I use in e.g. LTSpice but had forgotten to do this again in KiCAD … my apology for this 
Regarding your question whether I am new to KiCAD and PCB design I can say that I am somewhat new to KiCAD (and have had a long vacation = my mind memory needs to be refreshed) but I am actually quite experienced in PCB design not least when it comes to audio related PCBs. However, I have previously been using Diptrace and although at this point in time I consider KiCAD to be at least as “accessible” as Diptrace there are still some differences that I occasionally “stumble on”. This sometimes happens because KiCAD - to the way my intuition works - is not always as straightforward as I have found diptrace to be.
In any case the virtually empty library list when placing symbols is now solved - thanks!
Regarding my second library “challenge” - not being able to open my own library (called JESPER and containing about 20 individual .lib files) - I can see that in preferences->configure paths the KICAD_SYMBOL_USER_DIR points to the exact JESPER folder location on my drive. Yet, when - now correctly
- I try to place a symbol this JESPER folder is not included in the library list. I get an error message saying that the JESPER.lib does not exist … And I reckon it does not as “JESPER” is not a .lib file but a folder.
Also, when I try to either add a library line ("+") called JESPER in preferences->manage libraries->global libraries and select the library path to be the same as the KICAD_SYMBOL_USER_DIR I cannot select the folder as such but can only select the individual schematic symbols meaning that I am adding all of these files to the library “root”.
I know it should not be so - in my previous installation JESPER was a folder like e.g. the 74xx folder containing these 20 individual symbol files - but I just cannot sort out how I set it up the last time … Might you have a suggestion as to what I am doing wrongly? I have included a screendump of what the symbol libraries (in the project manager & inside eeschema) look like.
I assume it has to do with KiCAD not accepting the folder “JESPER” as a library entity - only the individual schematic symbol library files have a .lib name - but it worked the last time. So I am just wondering what I do differently here …
Again I would appreciate your help in this …
Cheers & thanks,
Jesper