Reaction forces are calculated only on those geometrical entities which are used while defining a fixture.
For example in case of a cantilever beam, one can calculate the reaction forces only on the fixed end of the beam.
If you like to see the response at these particular nodes then you can make use of the Workflow Sensitive sensors and you can plot the graph by using Probe.
Try to split the beam up in parts and then hide the adjacent bodies. In that way you can access free nodes only on the part of interest and then use free body forces on the nodes of interest.