When turning level on and off in level display, you never no how it reacts.
Sometimes when you do a single click on a level it toggles the display of that level. other times when you single click on a level you start a turn on/off all levels the pointer hovers over process and the process ends when you click one more time with the mouse.

in consequense, to turn on/off a single level you sometimes have to click one time on the level and sometimes you have to click two times on the level. And there is no way to see if you are in the one click scenario or in the two click scenario, so every time you have to try out if you are in scenario one or two.

The larger and more complex the file you are working with, the less predictable the level display menu behavior is (and the more annoying when unpredictable)

I don't remember to ever have this problem before v8i. Suddenly the behavior changed with v8i. a long time ago, I know, but still annoying. at the time i thought it was a matter of getting used to a new way of working. But you never get used to unpredictable.

What if one click always was enough to toggle the display of a level, and then if one wanted to turn on/off multiple levels, one would have to engage the shift button?
at least that would be predictable.