With preferences --> Edit --> deselect "Enable enhanced editing toolbar" we should get the old toolbar, this work in all namespace except in Page: namespace. Bug classified as Mediawiki extensions/ProofreadPage as I guess it comes from the javascript. Tpt if it doesn't come from the extension can you reclassify it please.
Version: unspecified
Severity: major
URL: https://en.wikisource.org/w/index.php?title=Page:U.S._Department_of_the_Interior_Annual_Report_1873.djvu/11&action=edit