Using Share->Export->Map to export a GeoTIFF but I can't set the resolution (dpi), only the image size which is not useful to preserve the a ground pixel size. Any suggestion on how to enable the resolution setting?
The short answer is that there are no "inches" in this scenario - there's no page to which you're writing the image.
For your use case if you want more pixels (resulting in a higher resolution image), you can request more pixels either by using the spinners or by typing in a higher number.
If you leave the lock engaged, the aspect ratio will remain the same even if you change the number in one or the other dimension.
Export to TIFF—ArcGIS Pro | Documentation
DPI
The resolution of the export file in dots per inch (dpi). DPI is only available when exporting a layout. When exporting a map, the dpi is calculated automatically.
which probably means you have to increase your width and height in pixels
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