I assume you know that your users can change the currency symbol by clicking on the "$ MM/DD/YYY" in the lower right corner of the calculator?
If you want to remove the currency symbol completely then you have to hack the code. In the plugin’s JS folder, find this file:
interface.LOAN-WIDGET.min.js
With a plain text editor, such as notepad open it up and search for this text:
a.CCY_CONVENTIONS=[{sep:",",dPnt:".",ccy:"$",ccy_r:""}
Should be around row 7. Change the “$” to “” as below. Save, and refresh the webpage
a.CCY_CONVENTIONS=[{sep:",",dPnt:".",ccy:"",ccy_r:""}
This will change the plugin’s default for you