No OK button in Frames Generator window

I’ve been working through the mesh kit manual and stalled on API Frames Ggenerator on page 61.
The + button adds a packet to the list, not a frame?
There’s no OK button in my window as shown in the manual?
What does the Copy frame button do? Doesn’t seem to do anything for me.
Am I doing something wrong?
Any help would be much appreciated.

Enable API mode and that should take care of it.

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Thank you Mvut, that fixed it.