How to Change Typo3 Powermail Extension Templates Path

From backend go into your root template (or in extension template where Powermail Extension is included).

In that, in Constants Editor Add below code:

plugin.tx_powermail {
view {
      templateRootPath = EXT:yourtemplate/Resources/Private/Templates/Extensions/Powermail/Templates/
      partialRootPath = EXT:yourtemplate/Resources/Private/Templates/Extensions/Powermail/Partials/
      layoutRootPath = EXT:yourtemplate/Resources/Private/Templates/Extensions/Powermail/Layouts/
     }
}

And in Setup, Add below code:

plugin.tx_powermail {
                view {
                      templateRootPaths >
                      templateRootPaths {
                                         0 = EXT:powermail/Resources/Private/Templates/
                                         1 = EXT:yourtemplate/Resources/Private/Templates/Extensions/
                                             Powermail/Templates/
                      }
                      partialRootPaths >
                      partialRootPaths {
                                        0 = EXT:powermail/Resources/Private/Partials/
                                        1 = EXT:yourtemplate/Resources/Private/Templates/Extensions/
                                            Powermail/Partials/
                      }
                      layoutRootPaths >
                      layoutRootPaths {
                                       0 = EXT:powermail/Resources/Private/Layouts/
                                       1 = EXT:yourtemplate/Resources/Private/Templates/Extensions/
                                           Powermail/Layouts/
                      }
                }
}