Gemini 3 Pro How to modify without affecting existing project?

Google AI Studio
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How to give Gemini 3 Pro or Flash Preview firm instructions for modifications without it affecting the existing project (design , IU ) ?

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Hello @nouahenri,

Welcome to AI Forum!
When testing a powerful new model like Gemini 3 Pro, it is always a good practice to isolate its changes to ensure you don’t accidentally overwrite stable code.

  • The most robust way to test extensive AI modifications is to create a temporary branch.
  • If you are using the Agent/Composer mode (which writes directly to files), try switching to the standard Chat panel. Ask the model to show you the code changes rather than applying them.
  • When the model applies changes to your files, you should see a Diff View (highlighting additions in green and deletions in red) before the changes are finalized. Use this stage to carefully review the logic.
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Thanks you Friend.

I hope we’re talking about the same thing. My concern is when I develop an application (project) with Gemini 3 Pro Preview or Flash Preview, It tends to break my UI and UX design for the project. I have to restore the app to get back to the prompt so it doesn’t make changes with the new design. I’m looking for a way to lock a validated design and make changes to the app without Gemini affecting my design.That is my concern