Option to unckeck header grayed out in legend properties

[annepower]

I am trying to get rid of the headers in my legend but the option to uncheck them is grayed out. The layers are not locked or anything as far as I can tell. What can I try? 

 

[DanPatterson]

does it become active when you click on the "Legend" name beside the lock in the table of contents (up from what you have selected in it)

[AubriKinghorn]

That particular layer type might not support headings, have you tried turning off the Layer Name? 

[Anne-MarieDubois]

Hi,

I know this posts dates a bit but I'm having the same issue with a raster. And no, it does not become active if I select the legend element.

Basically, it used to be accessible but after I deleted the "Value" heading from the Table of content, it just seems impossible to change it back. 

There must be a way that does not involve adding the layer again to the project and having to redo everything?

Thanks!