I guess you visited the website through a mobile phone. Click the menu subtitle and you'll see sports.
You're right. My mistake. It is visible through mobile too, but I didn't focus on the menu button since casinos usually list both casino and sportsbook separately below which is something their team needs to do asap.
I decided to ask the support, they suggested to switch to the incognito mode of the browser or try to clear cache and cookies, but still not working.
Incognito? Lol! This mode just masks your history and doesn't really help in this case which is why it's odd that they suggested this option. Try a legit mirror link of theirs if they have one which their customer care could help out with.