u/antihopeful

so my grandparents are not technologically savvy at all. they have a roku with a cable box. with their old cable box, when they turned the tv on with the cable remote it would go directly to cable, no need to be on the roku main screen and then click hdmi 1 and then get to cable. that cable box died and i had to replace it for them, and now i have to go through the process listed above. does anyone know how to make it like it was before, where once the tv is on it’s automatically on hdmi 1? they have optimum if that at all matters. thank you!