Hiding featured image from page

Hello, I have a featured image set for each page (not post) and it didn’t used to show up on the page. But now it does. How do I remove it from the page without switching off the featured image completely?

I have already tried the following but they haven’t worked.

1. Checking the box under “Basic settings” in the customiser, that turns off featured image in the full post.
2. Adding the following CSS
.page .entry-thumbnail {
display: none;
}

I’m out of ideas. Can you help please?