Latest tech news from the Wikimedia technical community. Please tell other users about these changes. Not all changes will affect you. Translations are available.
A new preference, “Enable limited width mode”, has been added to the Vector 2022 skin. The preference is also available as a toggle on every page if your monitor is 1600 pixels or wider. It allows for increasing the width of the page for logged-out and logged-in users. 
Changes later this week
The new version of MediaWiki will be on test wikis and MediaWiki.org from 29 November. It will be on non-Wikipedia wikis and some Wikipedias from 30 November. It will be on all wikis from 1 December (calendar).
Some wikis will be in read-only for a few minutes because of a switch of their main database. It will be performed on 29 November at 07:00 UTC (targeted wikis) and on 1 December at 07:00 UTC (targeted wikis).
Mathematical formulas shown in SVG image format will no longer have PNG fall-backs for browsers that don't support them. This is part of work to modernise the generation system. Showing only PNG versions was the default option until in February 2018.