An ad group or campaign's bid adjustment for mobile devices.
A mobile bid adjustment is set using any of the following methods:
- Set manually in campaign or ad group settings.
- A Search Ads 360 bid strategy applied to a campaign can automatically set device bid adjustments in certain types of engine accounts.
- A conversion goal applied to a Google Ads or Microsoft Advertising campaign can automatically set device bid adjustments.
If the mobile bid adjustment is set at the campaign level, all ad groups and keywords inherit this setting by default. Individual ad groups can override the setting; all keywords in such an ad group use the ad group's setting instead of the campaign's setting.
The column is included by default on the Campaigns and Ad groups tabs in a bid strategy's reporting table.
You can't use this column in a formula column.
Add this column to a report-
Navigate to an advertiser or lower scope.
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Click the Campaigns or Ad groups tab.
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Click the Columns button above the performance summary graph.
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Type the column name in the search box.
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Click + next to the column name to add the column to the Selected columns list.
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Click Apply.
You can click the pencil icon 
in a campaign or ad group row to edit the bid adjustment. However, if a Search Ads 360 bid strategy or conversion goal is setting the bid adjustment, we don't recommend overriding the adjustment.