Only one match type should be used in each ad group. This means that in the campaign structure, a broad ad group actually contains only broad keywords. The same applies to phrase and exact.
With the 'Clean-Up' service, you can now ensure that this is always the case with your ad groups. 'Clean-Up' cleans up your ad groups by, for example, shifting an exact keyword that was incorrectly assigned to a broad ad group into the correct exact ad group.
In addition, the respective negative keywords are set. For example, if you have set a broad ad group and an exact ad group, but no negative keywords yet, the keywords of the exact ad group will be set to negative exact in the broad ad group . Equivalently, this applies to phrase.