Accidental animation

Somehow, accidentally, I tagged an image as an animation, with one parameter having the animation indicator. As far as I know, I didn't do anything to do it, certainly not on purpose, and Animation was turned off as far as I know.
(1) How could I have done it, and how could I avoid it in the future?
(2) How should I undo it? I didn't see any way, so I edited the upr, taking out the code for the animation indicator, and re-saved the upr. Still, when rendering the image, the jpeg had "0100" appended to the name.

I do this accidentally on occasion too. I pretty sure the culprit for me is the F3 key which I think I must unknowingly activate perhaps when reaching for another nearby key on my keyboard.

Simplest fix, I think, is to hit F3 again (or "Animate" on the Animation menu) and also turn off the Animation Bar via the View menu, that usually works for me.

I'm afraid I don't know what state the fractal is in if you happen to make a parameter adjustment of some kind before realising your mistake. I also don't know how to clear the extended filename numbering on the render. Perhaps Frederik could comment on this?

Thanks, Velvet-Glove. I probably hit F3 by mistake. By the time that I realized it, hitting F3 again didn't help.

I was able to clear the filename numbering by opening a new fractal and dragging all the layers from the old fractal onto the new one.

The best way to cope with this is to open the Timeline tool window. Here you can directly view and remove any animation keys.

https://www.ultrafractal.com/help/animation/timeline.html