Tektronix 2232 keeping the trace alive for long periods

I'm having trouble keeping the trace visible when I scan long periods.

Example: https://youtu.be/PYqE_F2USAM

Is this something I can adjust?

Hi Ryan,

The 2232 has a digital storage mode which should allow you to view these slow sweep speeds much easier.
This mode is described on page 3-8 of the operator's manual available on the TekWiki: https://w140.com/tekwiki/wiki/2232
The slow speed storage mode is likely of most interest to you.

I will also mention that it does appear your signal is "clipping", as in, it's going over the vertical scale. This can result in inaccurate measurements.
I would suggest reading the XYZ of scopes: https://www.tek.com/en/documents/primer/xyzs-oscilloscopes-primer