formtabs has to be that format:
https://rtfm.modx.com/extras/revo/migx/migx.backend-usage#MIGX.Backend-Usage-Step2.1FormTabs
so in your case (with an additional title-field):
[
{"caption":"Fact", "fields": [
{"field":"title","caption":"Title"},
{"field":"fact","caption":"Fact","inputTVtype":"textarea"}
]}
]
Sorry, I have copied the formtabs as you have just posted. What does the grid columns need to be please?
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