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We analyze 347 galaxies at redshift $4<z<9.5$ using JWST observations fromthe CEERS program by fitting a two-dimensional parametric model simultaneouslyto the seven-filter NIRCam images to measure the overall structural parametersand quantify the global properties of the galaxies in the rest-frame opticalband. Particular attention is devoted to deriving robust uncertainties thatinclude, among other factors, the influence of cosmological surface brightnessdimming and resolution effects. Using the global S\'ersic index ($n < 1.5$) andobserved axial ratio ($q < 0.6$) as a guide, we place a conservative lowerlimit of $\sim 45\%$ on the incidence of galactic disks. Galaxies follow arelation between rest-frame optical luminosity and effective radius in theredshift range $4<z<9.5$, as well as separately over the intervals $4 < z < 5$and $5 \leq z < 9.5$, with a very similar slope but a marginally lower zeropoint in the higher redshift bin ($R_e = 0.69 \pm 0.05$ kpc) compared to thelower redshift bin ($R_e = 0.91 \pm 0.04$ kpc). Within the limitations of thecurrent sample size, we find no significant redshift evolution of $n$ or $R_e$at these early epochs.

The Structure and Morphology of Galaxies during the Epoch of Reionization Revealed by JWST