How to stop layers from expanding when selecting objects?

Thank you  Oddlythinkn and  manal_shanableh for trying to figure this problem out together.

I was having this annoying issue as well, and I couldn't find a solution online except for trying the solution suggested here. It did not solve my problem entirely, but it DID help me investigate my problem more closely. I know it's a year later, but I hope this helps Adobe or the community.

Here is my feedback:

Problem:

I have several layers and objects (rather than sublayers). All layers would stay closed when I clicked an object on them, except one layer. It was opening when I clicked on some of its objects. I tried several versions of enabling and disabling features in the Show Layers Only fly-out menu from the Layers panel, but it only prevented the layer from showing all the objects when it opened. That's where I noticed that a single object was causing this layer to completely open when I clicked that object. I had made this object into a Symbol, then detached it from being a Symbol (an option from right clicking on the object). Much later, on a different day after saving and closing, I discovered this irritating layer-opening-on-its-own problem.

NOTE: I'm editing between layers, locking and unlocking and turning on and off. So this layer constaly opening on its own was making it hard and annoying to work with my file - especially because I wanted to figure out how to make it stop.

Solution:

I moved all of my objects to a new, empty layer; and copied/pasted that ex-Symbol object. It seemed to convert to a true object, not retaining some of its Symbol properties that I had tried to detatch it from. This seems to have worked for me. Now I can click that object, and the layer remains closed.

Sorry for long winded response, hope this helps others!