how to scale the UI size to normal after using ctrl+MMB+Ｄｒａｇ

Support Basics & Interface
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Ｑ1:how to scale the UI size to normal after using ctrl+MMB+Ｄｒａｇ???(i mean shortcut is ???)
Q2:if i scale the ui size with the shortcut how can i keep it at next launch, do it save the percentage of UI automaticly?

Screenshot from 2017-01-15 18-37-15.png1366×768 174 KB

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Home. Save startup file.