Would it be possible to make it responsive?
There seems to be a hardcoded width:50em on the .movepage-wrapper class which seems to be causing the problem.
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This should be responsive. The fact it is not responsive is unrelated to MobileFrontend. Also applies in Timeless. A fix needs to be applied in core to this offending line:
https://gerrit.wikimedia.org/g/mediawiki/core/+/5d7987079b7f1a209407b8c0ef5dac34c99d603e/resources/src/mediawiki.special/movePage.css#7
Patch welcome.