I'm just going to put a link here to this epic comment by @fpolia21. Take an Experience Builder project from Developer Edition and register it as an Online or Enterprise Item. Or download it from your Online/Enterprise and edit it in Developer Edition.
https://community.esri.com/t5/arcgis-experience-builder-questions/deploy-exb-developer-edition-to-portal/m-p/1300966/highlight/true#M7313
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