Problem: Setting a selection tolerance has no effect when identifying WMS layer features
ArcMap allows you to set a selection tolerance in the Selection Options dialog. The tolerance is in pixels and affects the Identify tool as well as the Selection tools.
When identifying WMS layer features, setting a selection tolerance has no effect.
ArcMap cannot set a tolerance for WMS services. This is set by the WMS server.
Solution or Workaround
This is a known limitation with no workaround.