My smash into animation triggered this F_01
thing which might be an F Curve somewhere? More importantly than what it is in any detail is getting rid of it.
1 Answer
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You must have accidentally pressed M on the keyboard while your mouse was hovering over the timeline. These are called markers in Blender.
To delete it, select the marker with left-click (LMB), keep your mouse hovered over the marker area, and then press X then Delete Markers.