How to pop up an assist prompt by clicking some shortcuts?

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Hello Forum! Is that, I just want to use microflow expression. But in this window, I want to a window be popped up like this: But, if I do not enter “$” symbol, it will not exists. So, are there any shortcuts could let it arise? Thanks guys for your help in advance! :)
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1 answers
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Ctrl + Space usually opens the suggestions. 

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