Step 1 - Go to the "Databases" section and click "Manage databases" icon.
(see screenshot)

Step 2 - You can either delete the database via the "Del" icon or manage the user who have access to it via the "Manage access" icon.
(see screenshot)

IMPORTANT: In order to grant database access to particular user you first need to enable the user's mysql feature from the manage user section.

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