Based on the recent comments from users saying that they are no longer encountering this issue after the release of 14.0.1, we are marking this as Fixed.
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The drop down menu doesn't allow you to change between cmyk and rgb when exporting a jpeg file, sometimes the program get back to work after restarting, sometimes not.
iMac (Retina 5K, 27-inch, Late 2015)
Indesign current version