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If that feature is in every new part, it is in your start part. You need to remove it from the start part.
It is very likely a feature in your start part.
In case you don't know where your start part is located, check the following config option:
template_solidpart
If the new part is sheetmetal:
template_sheetmetalpart
Check this link for more details:
Configuration Options for Object Templates (ptc.com)