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Scattered light imaging of protoplanetary disks provides key insights on thegeometry and dust properties in the disk surface. Here we present JWST2--21\,$\mu$m images of a 1000\,au-radius edge-on protoplanetary disksurrounding an 0.4\,$M_\odot$ young star in Taurus, 2MASS\,J04202144+2813491.These observations represent the longest wavelengths at which a protoplanetarydisk is spatially resolved in scattered light. We combine these observationswith HST optical images and ALMA continuum and CO mapping. We find that thechanges in the scattered light disk morphology are remarkably small across afactor of 30 in wavelength, indicating that dust in the disk surface layers ischaracterized by an almost gray opacity law. Using radiative transfer models,we conclude that grains up to $\gtrsim10\,\mu$m in size are fully coupled tothe gas in this system, whereas grains $\gtrsim100\,\mu$m are strongly settledtowards the midplane. Further analyses of these observations, and similar onesof other edge-on disks, will provide strong empirical constraints on diskdynamics and evolution and grain growth models. In addition, the 7.7 and12.\,$\mu$m JWST images reveal an X-shaped feature located above the warmmolecular layer traced by CO line emission. The highest elevations at whichthis feature is detectable roughly match the maximal extent of the disk invisible wavelength scattered light as well as of an unusual kinematic signaturein CO. We propose that these phenomena could be related to a disk windentraining small dust grains.

JWST imaging of edge-on protoplanetary disks. I. Fully vertically mixed 10$\mu$m grains in the outer regions of a 1000 au disk