Depends who you ask , my method (which not everyone approves of) is edit the underlying files because I can rarely get parts editor to work for me. The official way to do this is in parts editor select the pin and in connections set the terminal to east/west/south/north. What that does is create a terminalId entry in the fzp file and create a 10 thou by 10 thou rectangle on the end of the connector. I prefer to cut out the middle man and in Inkscape create a 10 thou by 10 thou rectangle call it connectorxtermainal (where x is the pin number as in connector0terminal) and move it to the end of the pin. Then in the fzp file if it doesn’t already have an attribute terminalId=“connnectorxterminal” in the schematic view connector line, add it. An example (with the carets removed as the forum doesn’t like them and tries to use them as markup …)
schematicView
p layer="schematic" svgId="connector0pin" terminalId="connector0terminal"/
/schematicView
which ever way works best for you is good.
Peter