Enabling or disabling apps
This article covers adding and removing apps for both your main account and your customer sub-accounts.
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If you want to modify apps for a sub-account, masquerade it first. If you only want to modify apps for your main account, skip this step.

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Open the app explorer, and click the App Exchange button on the bottom left

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Find your app from the list, and click it

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Turn the switch to On, and choose either All users or Admin only depending on the access level you want to provide. Choose Save when you are done.

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Repeat for all other apps you want to enable