These are all great directions and obviously solutions for most, however none have worked for me. I am PC, SU Pro 16 and can’t delete unwanted templates I created while learning the program. I have searched the Layout Template folders and all files with the .layout extension and no matches to the template name. Do templates have a different extension? I have deleted the original file and the templates still show up.
Check for duplicate template names in the two locations...
These may be 'hidden-folders' so you might need to change your 'folder-options' to see them/their contents...
Windows has handy shortcuts to navigating to these folders even if they are hidden:
Type %programdata% or %appdata% to the Search box in Start menu or the Start screen and press Enter. The same goes for several other predefined system file locations.