Detailed FAQ about libraries after upgrading from V4 in the FAQ and linked below.
You are definitely still using V4 libraries as the library names all became singular in V5 i.e. you have ‘Capacitors_SMD’ but the V5 Libraries are ‘Capacitor_SMD’ . Do you have any environmental variables set (specifically KICAD_SYMBOL_DIR) with a trailing ‘/’ ?
Removed all ${KISYSMOD}/ libraries, having the s for plural at the end was a good confidence boost that I was doing the right stuff. I was a little nervous that I had something wrong as the FAQ mentions ${KIGITHUB}) where as mine on the MacBook where all ${KISYSMOD}/ but believed this was probably operating system differences.
Then selected and added all non plural libraries from my version 5 install all at once and it then all worked perfectly, picking up the non plural components including the SMD surface mount electrolytic that had begun my brief trip into purgatory.
I was very nervous about the process but having been pointed in the right direction, everything went smoothly and I am already forgetting the vexation I had after the first install of version 5.
The ${KIGITHUB} stuff was from V4 where updated libraries could be pulled in from the latest version stored on GitHub. There were a variety of technical issues with this approach and it has been abandoned. Just ignore the setting. Glad you got it working OK.