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I initially used Lü for last name but found that too troublesome and decided to change it to Lv, which is commonly used anyway. However, Lü still appears in the Lists, and when I go into that particular record through Edit at the Options for individual box on the top right, Lü shows at the top left of the page even the field's already changed to Lv.
Thank you in advance.
Did you "accept" the change after you made it? The change is probably still waiting for approval before becoming permanent.
This discussion properly belongs in the Help forum.
I notice that in the Help forum you show a screen capture that seems to exhibit this problem. What you have managed to do is to add a second name to the person. By having two name records, that person will show up twice in the list of individuals.
If you wish to change the spelling of a name, you need to edit that name, NOT add another.