How do I stop it from creating this plate when starting a new part?

Thank you!

21-Topaz I

If that feature is in every new part, it is in your start part. You need to remove it from the start part.

There is always more to learn.

1-Visitor

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

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