What have you tried yourself?
Thanks for your response. I have resolved the problem.
MindManager Templates are stored in the AppData folder here: C:\Users\username\AppData\Local\Mindjet\MindManager\21\Library\ENU\Templates -
Depending on your install language, the path highlighted in bold will vary.
After deleting a template, restart the application.
Note: If you repair the installation or reinstall the application, any deleted stock templates will be restored.
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