Currently, the “Stay signed in” option is checked by default. While this is convenient for users accessing Yahoo Mail on their personal devices, it can be inconvenient and potentially risky for users accessing their accounts on public or shared computers, as they must remember to uncheck the option every time they sign in.

Suggestion for improvement
It would be better to leave the “Stay signed in” checkbox unchecked by default.

Reason
Users accessing Yahoo Mail on their personal devices would need to check the option only once, provided their preference is remembered for subsequent sign-ins. In contrast, users accessing Yahoo Mail on public or shared computers would have to uncheck the option every time if it remains checked by default. Therefore, leaving it unchecked by default would be a more practical and secure approach.

This small change would reduce the effort required for users of public or shared computers, minimize the risk of unintentionally remaining signed in, and still allow personal-device users to enable the option according to their preferences.