Kate won't automatically select file extension txt

[citizen]

I am using Kate to save some text files (newly created), and I cannot find a setting to enable "automatically select file extension" for txt.
It is grayed out, and oddly it will activate for other file types. I scoured Google but could not find an answer and nothing in the manual either.
What on Earth am I doing wrong?

[Bings]

You don't need to use a file extension for text files.

[Cage72]

I am using Kate to save some text files (newly created), and I cannot find a setting to enable "automatically select file extension" for txt.
It is grayed out, and oddly it will activate for other file types. I scoured Google but could not find an answer and nothing in the manual either.
What on Earth am I doing wrong?

One way is to right click on the text file to open the context menu. Click on Open With then click on Other. It will bring up a menu list of all programs. At the bottom there is a checkbox that says Remember Application Association, click on that box then select Kate. After that all text files will open with Kate. Hope that helps.