With natural stone you can round off the edges with a grinder using different grades of bit on the pads.You can do similar if the porcelain is vitrified as the could tends to be similar all the way through the tile.
With ceramic or porcelain there won't be much you can do,there shouldn't be many cuts if any visible anyway.Corners should go into the corner then be siliconed over,edges are normally trimed with the cut edge under the trim.
Where was it that you feel the edge of the tile would be exposed and need rounding/smoothing off?
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