Trying to ad text to a sketch

Am I doing something wrong with my library & code ? I went through all my library's that said they were installed & got rid of everyone that had Adafruit liquid Crystal display . My code still shows
`#include <Adafruit_LiquidCrystal.h>

Adafruit_LiquidCrystal lcd(0x27,20,4);`
Shouldn't those disapear when I remove the library ?
So far I nave tried Cheap LCD, I2C_LCD , & it won't let me compile cause I keep getting this error code

/Users/mikeallen/Documents/Arduino/Lathe_Control_UNO/Lathe_Control_UNO.ino:7:10: fatal error: Adafruit_LiquidCrystal.h: No such file or directory
 #include <Adafruit_LiquidCrystal.h>
          ^~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.

exit status 1

Compilation error: Adafruit_LiquidCrystal.h: No such file or directory
'''
What am I doing wrong ? I know its something stupid , but that's where I am rite now .
thank you 
animal12