Would love to have categories from current post be highlighted

Yes, the element is li.collapsing.categories.self a
So you would have to add to your theme’s CSS something like this:

li.collapsing.categories.self a{
color: #ffffff !important;
}

The “!important” is necessary, otherwise it will not work.

For other CSS changes, a list of the different elements can be found in the plugin’s FAQ

Fran,
Thanks so much for this, but it doesn’t seem to work
I tried this in my custom.css

li.collapsing.categories.self a {
color: #D87C4A!important;
}

You are welcome.
It needs a space before !important
Let us know here if it works that way

Fran. It still did not work after I added the space. My site is https://www.freewaregenius.com. The collapsing categories are in the sidebar of single posts/pages.

I appreciate your help.

I am so sorry, I’m afraid I can’t help you more than this. I am not expert in coding myself so I can’t guess why in your case it’s not working.
All I Can say is that I did on my site exactly what you need to do on yours and it works for me the way I explained.

The sad thing is that the plugin’s developer is totally absent on this forum. It seems impossible to ask for his/her help.
Kurdi, I hope someone else will come forward to help you solve your problem. Again, I’m sorry I can’t.

Me again

From what I observed on my site, the current page item is bold by default (requested by default by “Collapsing categories) while all other items are normal (not bold).
On your site I see that all items are bold. So maybe if you could change the css for your widgets so that by default, list items in widgets are not bold, then, in the “collapsing categories” widget, only the current page item would be bold. I mean it would not be in a different color but at least it would be bold while the other items would be normal.

Do I make sense ? (let me know if my thought is not clearly expressed – I keep an eye on this thread)

Thanks Fran. I was able to remove the bold from my sidebar, but was not able to get the current categories highlighted. ??

Thanks for all your help though.

It’s weird that your current page item is not bold now…
I’m sorry I couldn’t help better. Again, I hope someone more knowledgeable will shop up…