To remove the shadow effects, follow these steps:
Go to "My Publications" in your account.
Locate the magazine that you want to edit.
Look for the pen edit icon positioned to the right of the magazine and click on it.
Select "Player Settings" (1) from the options.
Within the Player Settings, find the checkboxes labeled "Shadow effects"(2) and uncheck them.
By following these instructions, you will be able to successfully remove the shadow effects from your magazine.