I use digital mostly nowadays since I actually have learnt to use it (yeah right....). Only I have trouble triggering on pure DC signal, like 9v battery voltage apart from single shot/rolling
Triggering on a flat DC voltage isn't really a thing.
In "Auto" triggering mode your DS1054Z will display a trace using a timeout as well as a real trigger.
In the top corner of the screen it shows "Auto" when the trace was being drawn because of timeout and "T’D" when a trace was drawn because of a real trigger event.
See the "Trigger mode" section of the manual.
This was the function that bugged me most with the only early DSO I actually used over a reasonable length of time.(A Tek THS720A)
When I troubleshoot equipment, I use a 'scope "DC coupled" & in "free running" mode to look at the DC power supplies as I go along.
There is usually no need for high accuracy--- if say a supply looks "about" 5v, it is probably OK.
You then can look at signal levels, only triggering the instrument when you need to.
Try as I might, I couldn't find an equivalent of making an analog 'scope "free run".
The nearest was "roll mode", which wasn't really satisfactory, because, instead of the whole line shifting upwards when the probe was placed on, say +5v, it would display it as a transient.
It seems modern DSOs do not have this limitation, & there
is a workaround with the THS720A, but It it wasn't evident at the time.