and if you switch to the compacted secondary engine instruments mode on the upper DU and the lower DU is blank, you don't have the pop up feature...right?
Here's what the FCOM says about your last question.
Exceedance Indication
YA609, YK910 - YM652
Displayed as rectangular box outline around secondary engine parameters if limits are exceeded when compact display is selected.
The outline has thick lines and blinks for 10 seconds. After 10 seconds, the lines are thinner and do not blink. The color of the outline matches the color of the exceedance - amber, red or white.