Hello,
To ensure the main window redirects, please try creating a dedicated Web Page, on which you can place your Entity Form.
When you directly connect your Entity List to the Entity Form, it always opens up in a popup window, the redirect often misbehaves, because that Entity Form is stuck inside of the popup.
If you create a dedicated Web Page, on which you place your Entity Form, you can connect that on the Entity List instead. When configured like this, if you click a record from the Entity List it will open your dedicated Web Page (with that form) and after saving, that full page will be redirected.
Alternatively: If you feel you want to keep using the popup, you could embed a frame buster script on your portal page. This will bust out of the popup, if a page accidentally gets opened inside of a popup. Via the Portal Administration app, open the the Web Page you want to redirect to and add this piece of custom JavaScript on the Advanced tab:
if(top != self) {
top.location = location;
}
