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If I host my own mediawiki, will the fixed line length be enabled automatically, or do I have to configure something?

I've deployed 1.34.2, but lines still seem to span the entire screen.

It should be the same, uncheck Use Legacy Vector in Special:Preferences (at least, it is for me in 1.35rc3). I haven't found a setting to make that the default, however.

You can make any preference default by adjust $wgDefaultUserOptions

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