Outlook uses the same template location as Word. If you have not changed the preferred templates folder it can be located (in English language versions of Windows) by typing
%appdata%\Microsoft\Word\Templates
in the Windows File Explorer Address bar and pressing Enter.
However it has been reported that Office 2019 does not automatically create the default folders. I have no evidence of this beyond anecdotal, but do check Word > File > Options > Advanced > File Locations and see if the Templates Folder is listed. If not add-it. While you can remove the contents of the folder, I cannot see that there is anything to be gained by deleting the folder itself.

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Graham Mayor - MS MVP (Word) (2002-2019)
Visit my web site for more programming tips and ready made processes www.gmayor.com