You can do this with Step 1 below. Step 2 and 3 are for waking up from sleep and screen saver.
Step 1. Type netplwiz.cpl in Cortana Search box > Click netplwiz.cpl > Select your user name > Uncheck Users must enter a user name and password to use this computer
Step 2. Windows Key+i > Accounts > Click sign-in options > Under Require sign-in select Never
Step 3. Windows Key+i > Personalization > Lock screen > Screen saver settings > Uncheck the box to On resume, display logon screen