Hello and welcome to the Babylon community! We have a contributing guide docs Start Contributing to Babylon.js | Babylon.js Documentation that runs through the steps needed to modify/run the frameworks and all the parts yourself. There’s a section for the editor: Start Contributing to Babylon.js | Babylon.js Documentation (babylonjs.com). We try to make it as easy as possible to run, so if you have any difficulties setting it up please let us know!
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