To add on to what @Angel.L said above, when you change a feature when previewing in the app, the characters will forever stay that way unless you change their features again. But don’t worry, this only shows for the author. When you publish you story, your readers will see the character in the original features you created them as. If it really bothers you, you will need to just change their features using the “@CHAR changes [feature] into [feature]” so that they revert back to their original look.
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