Parameter calculator

Hello there.
when I pressed a certain key at the same time, a window for inputting the propeller size and battery capacity appeared, and at the end I saw a value such as ATC_ACCEL_P_MAX. Does anyone know what key it is?

Alt-A is the key combination that you want.

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Oh, thank you amilcarlucas.
It was alt+a.
Admire your knowledge.