Using Windows 11 home
Issue 1 Library manager is empty as shown below:

Issue 2: Automatic library updates produces several failures as shown below (as an example):
Failed to update Adafruit GFX Library. Error: 3 INVALID_ARGUMENT: The library Adafruit GFX Library has multiple installations: -
C:\Users\occam\Documents\Arduino\libraries\Adafruit-GFX-Library-master -
C:\Users\occam\Documents\Arduino\libraries\Adafruit_GFX_Library
Automatic library install can't be performed in this case, please manually remove all duplicates and retry.
Questions:
-
How do I fix issue 1 ? Tried re-booting IDE, waiting , adding a library with no joy.
-
What is the difference between these two libraries?
.....\ Adafruit-GFX-Library-master - and
.... \libraries\Adafruit_GFX_Library
2a: How do I know which of the two libraries to delete?
2b: Is there and easy way to "manually remove all duplicates and retry."
2c: How do I avoid this situation in the future?
PS: Opened IDE 1.8.19 and library manager there showed all libraries and seemingly updated all libraries without error.