After changing the username in Windows 10, both the old and new names appear (opens in new tab)

When I initially set up my username, I accidentally included an extra character, so I later changed it following the tutorial. However, the system now displays both the old and new usernames, and when I click on the folder with the old name, only one folder remains. Does this situation affect the system or my account? Was the name change successful? How can I resolve this issue completely?