You can override a standard action with an Aura component in both Lightning Experience and mobile.
You need at least one Aura component in your org that implements the lightning:actionOverride interface. You can use a custom component of your own, or a component from a managed package.
Go to the object management settings for the object with the action you plan to override.
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Select Buttons, Links, and Actions.
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Select Edit for the action you want to override.
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Select Lightning component for the area you want to set the override.
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From the drop-down menu, select the name of the Lightning component to use as the action override.
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Select Save.
note: Users won’t see changes to action overrides until they reload Lightning Experience or the Salesforce mobile app.
See Also