Portal Add "Save and Close" button to Entity Form

Hello,

I have a webpage which includes an Entity Form. I have default submit button for this form but I want to add a new button for "Save and Close" process.

I know that I can go different pages under "On Success Settings" tab. But this works for only default submit button. I need this for custom button.

I can add buttons with JavaScript. But how can I send a custom URL after submitting the form by clicking custom button.