Warning: Eye marker is disabled in current view

The Classic Editor

Marks are available in the default Visual editor if you are using the Classic Editor plugin. If you are using the text or HTML editor, please switch to the Visual editor. You may need to update the content or refresh the page to activate the marks.

The text or HTML editor looks like this:

Switch to the visual editor which looks like this:

Gutenberg

In some cases, you may see a block that appears as the classic editor as shown in the image below

You will need to convert this block to a Gutenberg block by clicking on the three vertical dots to the right and then selecting “Convert to blocks”. As shown in the image below. When you do that, the block will change to Gutenberg text blocks. Yoast is then expected to highlight these.