How can I test the content via the default theme?

Problem/Motivation

It looks like this is using my admin theme to test the content - how can I force it to use the default site theme? I'd like the testing to happen with the version of the content that end users are likely to see.

Or maybe this is already the case and I'm missing something? I tested by creating a custom template in my theme, e.g. `node--page.html.twig` and hardcoding content. When I view my page, I see the hardcoded content, but the Yoast Analyse tab is showing statistics, etc like it's analyzing the actual user entered content. E.g. I see that "25.8% of the sentences contain more than 20 words, which is more than the recommended maximum of 25%." but my hardcoded content contains two sentences totaling only 19 words.