Colors/Themes
I did not like the gray background of read e-mails. The unread ones should be bold black as they were previously and the read ones should be on a white or lighter background. It is currently very confusing...

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Keith commented
I do not care for the New Yahoo Mail. Since the change, I am unable to change my theme colors (I hate the color purple), I do not like the complete white background, the dark mode is too dark. I am unable to send any type of files, and most important since the change I have lost important contacts, their names and email addresses are gone. My signature is now in black instead of a color, which is required by my department. As I am unable to hear, I am unable to use a phone. Yahoo needs to have some type of email support contact. The so Chat Bot cannot answer the questions I am asking. Yahoo email is looking more like Gmail, which I do not care for either. Hotmail has too many bugs in the system.