Run beamOn not displaying

Hello everyone!
Please I’ve been able to run collimator geometry, but there seems to be a problem with the “/run/beamOn” command

A lot seems to run from the command prompt and displays the attached info, but the display of the collimator simply vanishes when I try to “/run/beamOn”. I can’t also change the particle from “gamma” to “alpha”.

yes, you can change this in vis.mac file.

in the attached image , can you see the output. it is clearly saying that you have to change detector view.
and you can directly change this , "just see above near the play button in your attached image "
and let me know are you able to do it.

Thanks a lot, Priyanshu-gif.
I’ve worked it out.
I’m grateful for the support.