How to delete all Personalizations for all users in Dynamics 365 ?

This Feature allows you to rest all forms to default design for all users by one click 

just go to  system administration /setup/Personalizations as below 

you need to edit this form to continue 

in system tab, you can enable personalization and delete all personalization for all users 

click delete all personalization for all users button to see the warning message as the below 

click yes to delete all personalization and wait until finish your request 

after finishing, you will find a message as the below