This is related specifically to Dataspell 2022.2.2 build #DS-222.4167.34.
I have ipython-autotime installed in my virtual environment.
Dataspell allows you to open a dataframe in a new tab by clicking on "Open in new tab" per screenshot below:

When opened in a new tab one has unlimited scrolling capability.
But when autotime is enabled in Dataspell (Jupyter Notebook) it disables the ability to scroll through dataframe output, instead showing the head of the dataframe, an ellipsis break, followed by the tail of the dataframe.
Not sure if this is a Dataspell issue or an autotime related issue.