In the dashboard, you can select multiple identities by clicking the circle icon at the top left:

Once you have selected multiple identities in this manner, you can perform the following actions: Delete, Ignore, or Change Category:

Deleting identities en masse:

This action will delete all selected Identities at once

Ignoring identities:

This action will ignore all selected identities, if any are currently unignored. If all identities are already ignored, this action will unignore all the selected identities.

Moving Categories:

This action will place all selected identities into the same category together.