@BenediZ
I still wonder why it does not auto-frame (and auto-scale) the keys in the active timeline range in a manner, that the user can immediately oversee them and work with them.
If you have the animated object selected, then opening the curve editor should zoom to the animated properties displaying the curves. (At least it does this on my system currently using Max 2020.3, but worked same way in previous versions). If nothing is selected in your scene then when you open the curve editor it doesn't scroll/zoom to anything.
In the View menu of the Curve Editor, the last item is "Enable Autozoom". Try toggling that on if it is not already and make sure that you have the animated object selected before opening the curve editor. Other than that I can't reproduce your issue on my system.
The only other thing I can think of is are you using Maya navigation by any chance? The only reason I mention this is a one liner in the max docs that may or may not have anything to do with this:
"Note: How you zoom and pan in the Key window depends on which interaction mode, 3ds Max or Maya, is active"
https://knowledge.autodesk.com/support/3ds-max/learn-explore/caas/CloudHelp/cloudhelp/2021/ENU/3DSMa...