Advice for Configuring Course Endpoint

I am working with a partner who uses an external platform to host their content that is built in Rise. It is not using a formal LMS. The support manager is requesting to configure the endpoint of the course so it opens in the same window. Basically, when the learner clicks the Complete Course button (last lesson), i've configured the button to direct to a URL and they need that URL to open in the same window as the Rise course. Does anyone know if there a way to configure this from a development perspective? TIA!