How to manage dapp permissions
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You can manage dapp permissions easily by clicking the 3 dots in the top right of MetaMask and selecting "All Permissions." This will show you a list of connected dapps, allowing you to click into each dapp and connect more accounts or disconnect all accounts.
Another option is managing permissions on a per-dapp basis, as shown below.
Manage permissions when connecting to a dapp
When connecting to a dapp, MetaMask will ask you to review the accounts and networks that the dapp wants to connect to. You can manage these permissions by clicking 'Edit' next to each section.