Hi Des,
As far as I know, that "We support markdown! Try **bold**, `inline code`, or ``` for code blocks" text is a fixed placeholder from the underlying Atlassian rich-text editor itself, not a field-level default value you're setting — so it can't be edited or removed through the paragraph field's configuration.
I haven't found an admin toggle to disable it specifically on Forms. Two things that might help in practice:
1. It's only a placeholder — it disappears the moment someone starts typing, so it's not visible once the field has content.
2. You can add a short, clear Field description above the paragraph field explaining what you actually want them to enter. Since that text renders separately from the placeholder, it gives non-technical users something more relevant to read than the markdown hint.
Not a true fix, but it's a way to reduce the confusion until (if ever) Atlassian adds a way to override it.
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