@LAERCIOSANTANA Hi, open the Slideshow Maker again, use the drop down option at the top to select your template, Delete is at the bottom,
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The files are at - C:\Users\Public\Documents\MAGIX\Common\Videocontent\Movie Edit Pro Premium\VideoEffects\Styles, it might be slightly different for your program, the file is saved under the name UserDefinedStyle_001, I don't know if there are other files created.
Thank you - easier than I thought - I didn't actually see the button on the inside of the frame. The path to my program is "C:\Users\Public\Documents\MAGIX\Common\Videocontent\Movie Studio Suite Content\VideoEffects\Styles"