Just as an update, I found a trick or somewhat way around this issue that may help others in the future.
Basically, it seems Capella’s rending is based on the screen resolution on startup, so you can reduce the screen resolution to 1080p, start capella (and wait for it to fully load), and then change the screen resolution back to the native level, and the Capella render appears to work fine as long as Capella is left open.