displacement at a roller slider support of a beam

Hi

i'm simulating a simple beam on two end supprts.

one support is defined as immovable, the other is  a fixture with a reference geometry that will allow axial translation  (roller slider).

a force is operating in zx plane at midspan on anywhere along the beam.

i would expect to see a longitudinal displacement at the roller slider but that is not shown on results.

what is the reason for that ,is there anything  wrong with the fixtures definition ?

thanks for answering me

Zvi

SolidworksSimulation