When starting a new translation, or opening an older saved one, the editing toolbox is placed below the two text windows, rather than next to it. I have noticed this issue since about June 1. If relevant - tabs I already had opened with a translation in progress still have the toolbox next to them. Could it be that the text boxes have suddenly become too broad to fit in the toolbox?

I am using Firefox. This issue has been reported by numerous other users at Mediawiki (https://www.mediawiki.org/wiki/Talk:Content_translation), including people who use Chrome.

Edited to add: The toolbox returns to the side when zooming in on the page. I got it back at 150%, someone else said 125%.