Finder sidebar with tendency to disappear

[asiga]

First of all, I know how to enable the Finder sidebar again, just by switching it on from the Finder preferences.

However, from some strange reason, I've been experiencing that the sidebar has a tendency to disappear on some Finder windows, on at least two of my Macs (one running ML, the other SL). I'm not sure if the Mac running El Capitan suffers it or not.

Since this has been happening since I upgraded one Mac to El Capitan, I'm thinking if it could be the cause, because I sync my files directory tree in all my Macs with rsync, so... I'm wondering if El Capitan changed any specification to the hidden "DS_STORE" files which might be causing this?

One very noteworthy case is the root foolder of my USB drive (formatted with OS X format): One day its sidebar disappeared on my SL Mac. I enabled it again. I plugged the USB on the rest of my Macs (ML and El Capitan). And a couple of days later, I plug it again on my SL Mac and voila, the sidebar disappeared again.

Note: I've never seen this in my Macs before, from Tiger up to Yosemite, and I've been syncing my data tree with rsync for years now.

What's happening here?

 

[Gregg2]

There used to be an oval in the upper right corner to toggle that on and off. I think I read that it is now invisible. Try clicking there and see if anything happens.

 

[asiga]

There used to be an oval in the upper right corner to toggle that on and off. I think I read that it is now invisible. Try clicking there and see if anything happens.

I've no problems for enabling the sidebar again. The problem is that it will disappear again after syncing files from other Macs (with different OS X versions). As I said, I've never seen this issue until a few weeks ago, which was also the time when I updated one of the Macs to El Capitan.

 

[asiga]

I didn't mention that I was also experiencing issues with the sidebar width: it became suddenly too narrow on my Snow Leopard and Mountain Lion Macs after syncing files from an El Capitan Mac. I'm suspecting both problems (disappearing sidebar and being too narrow) are related or even the same.

I did some search and found this, which could be related to the issues I'm experiencing:
https://www.reddit.com/r/OSXElCapitan/comments/3dc130/finder_sidebar_does_not_remember_custom_width/

 

[BrianBaughn]

Have you tried excluding the .ds_store files from the syncing?

 

[asiga]

Have you tried excluding the .ds_store files from the syncing?

No, but I agree that it might be the only solution...