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I don't believe that InDesign has an equivalent feature.
If you press the Command key (Ctrl on PC) while clicking on one of the disclosure arrows to open a layer, it will open all layers and show their contents. At least you can quickly see all the objects...still will have to scroll though.
Thank you Dan and Erica. I appreciate your response. I am now transitioning from using mostly Illustrator to using InDesign more frequently and I am seeing the two programs have many differences!
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I believe CTRL/Command + click on an closed arrow will only expand all layers/groups that have the same level of hierarchy.
Meaning it won't display the whole content of each layer.
But... ALT (PC) + Click on an closed arrow will expand everything in the clicked layer (or group)
As an example, I want to "locate" the red stroked square in my layer panel.
I would start by CTRL + clicking on the arrow of an expanded layer in order to close all layers. (But it's not really necessary)
Then I would Alt + click on the arrow of the layer that contains the selected object.
Piece of cake: just notice the colored square on the right hand-side of the layer. Red in my example, because Layer 2 is red.
Now, all you have to do is to look for the big colored square that flags the selected object. Small colored square flag the parent groups of the object. If you reaaaally have a lot of stuff, you might have to scroll down a little bit, but it's still quite easy to locate.
See example below:
thank's for that hint!
Hm… with my laptop where a German Windows 10 version 1803 and a German InDesign CC 2018.1 is installed it is Strg + Alt + Click to open all layers. That said: All layers that contain contents on the active spread. The ones that contain no contents will not be opened.
EDIT: Misread your sentence above. It says "in the clicked layer (or group)", not in the entire Layer panel.
For all layers in the Layer panel that contain something it's: Strg + Alt + Click .