Query block loading icon can not show out, no contents in docs

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1

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hi, heroes, how can i show out the loading icon here? i tried couple of times, it just can not show out when loadding contents. i am not sure it’s a bug or i am setting in wrong way

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what does it mean of “history”, “end”, “error”

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plus, ican not find anything on this in offical docs

2

There is no need to write in FULL CAPS. It sounds rude.

3

, o , my god, i do not know about this, let me low the caps. thanks to tell me, @dranzer ,