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The Vercel Toolbar is a tool that allows you to leave feedback, navigate through important dashboard pages, share deployments, use Draft Mode for previewing unpublished content, and Edit Mode for editing content in real-time. zopio has the Vercel Toolbar enabled by default. Go into each application and run vercel link, like so: 
cd apps/app
vercel link
This will create a .vercel/project.json file in each application.

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Add the environment variable

Then, simply add a FLAGS_SECRET environment variable to each application’s .env.local file, like so:
.env.local
FLAGS_SECRET="test"
These two steps are optional, but they are recommended to ensure that the Vercel Toolbar is enabled in each application.