To delete an anti-affinity group:
In the Servers and VMs tab, select the server pool to which the anti-affinity group belongs in the navigation pane.
From the Perspective field in the management pane, select Anti-Affinity Group from the drop-down list. Select the anti-affinity group in the Anti-Affinity Group table and click Delete Anti-Affinity Group...
in the perspective toolbar.
A confirmation dialog box is displayed. Click OK to delete the anti-affinity group.
The anti-affinity group is deleted.