The standard libraries are read only . . . if you want to create a new symbol or edit an existing one you need to create a custom library and add the new/modified symbol to that.
FAQ here: Kicad 7 Tips 'n Tricks when making Personal Symbol Libraries
The standard libraries are read only . . . if you want to create a new symbol or edit an existing one you need to create a custom library and add the new/modified symbol to that.
FAQ here: Kicad 7 Tips 'n Tricks when making Personal Symbol Libraries