%mythicprefixes_prefix_<prefixID>% - PREMIUM Display the prefix only.
%mythicprefixes_no_<displayPlaceholderID>_<number>% - PREMIUM Display the Xth tag of the current display placeholder. For example: %mythicprefixes_no_chat_2% means the second tag displayed in chat display placeholder.
Now if your display placeholder ID or prefix ID includes _ symbol, you can replace them to - symbol to avoid plugin may not parse them correctly.