Hi Raphael,
No problem. To check the reaction forces, you can drag-and-drop the desired fixed support onto the Solution Information branch (check the screenshot below) but I suspect that this will produce the same Force Reaction you might have seen earlier if the support was selected properly.
To verify your explicit dynamics simulation, it is always a good practice to check the energy summary. You may find this forum thread helpful:
Successful explicit analysis (ansys.com)
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