Under "Buildplate adhesion", make sure you select Brim for the adhesion type, and set Brim Width to 0.
The maximum size I can resize an object to with that setting on a UM3 is 191.89 * 207.89 * 299.99 mm. This is fairly close to the advertised build volume for dual extrusion prints. Cura currently cannot create single-extrusion prints that take advantage of the additional space in the x-direction, but I am fairly sure a future update will.
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