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From looking at the code, AMCL sizes the pose array in the "particlecloud" message to be the size of the number of guesses it currently has for the robot's pose. There's no way to change its initial dimensions. If you just want the current pose of the robot displayed in rviz, you can enable TF frames and look at the "base_link" frame relative to the "map" frame. The "particlecloud" message, provides a visualization that helps give insight into the particle filter AMCL uses internally.