How to kill a notebook process

[ChrisCowin]

I've tried everything I can think of to kill a running notebook that is stuck in a loop and nothing works. The Interrupt Kernel button is always grayed out, tried restarting the kernel through the command prompt (P Key) but this doesnt seem to do anything either. The only way I've figured out how to stop the process is to kill the entire application in task manager.

[JackFanZhang]

2026 running 3.4.4 and having the same UI block issue, it's disappointing as it's been a bug for long period of time since its first version. Basically, most of the buttons on the Ribbons in Pro got blocked while the notebook running, in my case add a 30 feature classes to a map and put them into different layer groups, but I did pause the map rendering. And even more disappointing when see users on 3.5.x still got the same issue. not acceptable!