You might be able to work with it placing the paper in one of the other slots, and use some masking tape, or similar to set the paper's left and right position, if necessary. But, as stated, that's a very large easel for that enlarger. Unless you're planning to do large prints routinely (in which case you'll need a bigger enlarger anyway), you might be happer with a smaller easel for day to day use.
You coud wall mount the enlarger and remove the baseboard which will give you more room, but a smaller easel would be more a more practical solution, most likely.