When cropping a video or image using the "Ken Burns" tool — say you wanna scale-and-pan-and-scan a portion of said video or image — by default, both the START and END frames snap-to invisible alignment guides.
And if you DON'T want the START and END frames to snap?
There is no 'disable alignment' or 'turn of snapping' checkbox.
Here's what I discovered by accident:
Simply hold down the COMMAND key when moving or resizing a START or END frame and they won't snap to those invisible guides.
Take your finger off the COMMAND key and the frames will snap.