Which setting applies to the ad unit when the parameter is set at multiple levels?

Last edited: 2025/09/09

On/off settings

This refers to enabling specific features or modules (e.g. Refresher, Bidder).

Each Inventory level works as a semaphore for settings on lower levels. For example, to enable a given Bidder on an Ad Unit, you must first enable it on both Domain and Workspace levels. The Inventory hierarchy is as follows:

  1. Workspace (highest level)
  2. Domain
  3. Ad Unit (lowest level)

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For your convenience, the Platform displays an alert if a feature is disabled on a higher Inventory hierarchy level:

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Features’ parameters

This refers to the parametrization of specific features (e.g. Auction timeout).

The final setting for a given Ad request is always taken from the lowest possible level. The hierarchy of settings is as follows:

  1. Layout (learn more)
  2. Ad unit
  3. Device (Mobile / Desktop)
  4. Domain
  5. Workspace

This means that if a certain setting is set on e.g. Device and Domain level, the Device level setting will be used on a given ad request.

Example: Setting Prebid auction timeout per Layout

What will be the timeout setting used for an Ad unit from Domain a.com?

We have the following settings:

In this example, the Ad unit gets: