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Yes, if you’re replacing a door slab, it must be the exact size of your existing door. If your new door is too small, you’ll need to purchase a new door to fit or hire a handyperson to make your frame smaller. Or if it's too big, you’ll need to return it or shave it down to fit.

You can convert a pre-hung door into a Dutch door, but it’s more of a pain. Pre-hung doors are already set in the frame with the hinges and everything aligned, so once you cut the slab in half, you’ll likely need to adjust the hinge placement and maybe even mess with the frame itself. It’s doable, but expect some trial and error because it’s not a straight-swap situation.

Instead of a bifold door, you might look into installing French doors, pocket doors, or sliding doors. Each has its own pros and cons. French doors offer the dual-door advantages that bifold doors do, and pocket doors are excellent space savers—though you’ll need to create a wall cavity to have them installed. 

While not strictly required, it is highly recommended to shim both sides of a door. Shimming both sides allows you to make minor adjustments for wall framing that isn't perfectly plumb, ensuring the door is level and hangs evenly. This practice helps the door swing open and close smoothly, reduces the chances of the frame warping, and can be used to center the door within the wall opening. If you are working alone, you may find it easier to remove the door slab to lighten the weight while supporting the frame and inserting the shims. With two people, the process is generally faster and easier, whether the slab is left in place or not.