There is no easy method. There was a post on here by robva65 a number of years ago with instructions on how to create a flash object in your PPT deck that hid the player skin, but that was the only option I've ever seen for Presenter. If I can find the post, I'll provide the link.
Thks for your answer.
The flash solution for the skin is not adapted with an Html5 export so .... Perhaps Ispring is the solution in this case ..
Thanks for your help!