Not everyone does that but for security and personal protection logging out from accounts always beneficial. Moreover, your personal data could be stolen. You may lose your account or your password may be changed or hacked without your notice. If you use a public computer or someone’s gadget for urgency then it is very important to log out. So, if you want to use your yahoo account again, in that case, you need to sign-in again. In the image, you can see an option called to sign in with yahoo, which indicates you have correctly made it to logout of the yahoo mail.
