Hello,
I'm under Spine 3.6.52 on Win10.
When having the export windows open, and then the settings option popup open, if I press tab
to go to the next parameter, see how the behavior is weird, going under the popup on the dopesheet.
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I tried on Mac OS El Capitan 10.11.6 and the behavior was the same, except the cursor moved under the popup only at the end of all the popup parameters.