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This PowerApps screen will pop up which will allow you to view the Apps Environments you have access to (or have been given access to).
Select the environment you want and it will put a check mark and then click the “x” so it will filter for only that environment.
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Then Scroll down to bottom and you will see all the apps created in that environment
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To work on or view the apps you can click on side menu Apps and will get a list of your apps
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Once in the environment you can also create new apps, etc from the side menu. For example to create a new app just click on +Create
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