User Impersonator module allows you to sign in as another user. This module is helpful especially you want to operate or troubleshoot of a particular user. To use this module you need to go to Admin Dashboard and click the "User Impersonator" menu.

In the User Impersonator admin screen. You will be able to select or switch to user account you want to impersonate.  Only user accounts with no "Administrators" role will be listed in the dropdownlist.