**Steps to replicate the issue**:
* Enter an article page
* Open source edit while having the 2017 wikitext editor mode enabled
* Do some sort of edit so that you can press "Publish..."
* Press "Preview" and observe atop the page
**What happens?**:
There is an unfortunate overlap of page elements at the top of the page, which might render the text difficult to read or interact with.
Jon Harald Søby mentions that using dev tools when looking into the issue does not replicate it.
**What should have happened instead?**:
Ensure that an overlap doesn't happen, or that elements are hidden in this mode.
**Other information**:
I have tested using Google Chrome on nowiki.
Screenshot with problematic area highlighted with a red square.
{F41438648}
Jon Harald Søby has also tested using Firefox 118.0 with Ubuntu on enwiki, his screenshot:
{F41438654}