I just tested in 7.5 and it functions the exact same way: Arrange window needs focus.
May I humbly suggest, in good fairness, that you consider putting a [Solved] in front of the title. 
Let’s save our CMC abandonment anxiety wrath (for now) and hope that by the time our pitchforks and torches and sharpened and lit, we’ll be on Cubase Pro 22, where the preferred method of input is holographic gesture and thought-control. 