Yes – I presume that in this use case that’s what’s needed. They recorded some midi, and now they simply want the same tempo, but with a bpm that is double the previous value.
I will stipulate that’s it’s weird to talk about tempo this way, which is due to the static nature of the bpm value in the transport panel.
This issue was dealt with when click patterns were introduced, which allowed us to define the beat manually. But then of course, the bpm value in the transport is no longer the actual beat, but some multiple or factor of the beat. This has generated many questions from users!
@Louis_R Well yes, the midi part moves, but only as a consequence of the midi events inside it having moved.
Also of note is that the visual effect of these changes depends on the ruler settings and the primary time format.
Finally, the OP titled the topic as “Change Tempo while Midi remains fixed.” Martins answer is the precisely correct one for that question.
@ggmanestraki explains some more in Cubase (11 Pro) BPM and Tempo - #8 by ggmanestraki