Can they even see the domain? Assuming you're not using the ISP's DNS of course.
Unless you're using DNS over HTTPS they can see the unencrypted DNS traffic. There's also Encrypted Client Hello, but they can also see which IP you're connecting to.
alt Hacker News
Unless you're using DNS over HTTPS they can see the unencrypted DNS traffic. There's also Encrypted Client Hello, but they can also see which IP you're connecting to.