1

Set up a golf video to study my positions at different stages ie on the Takeaway & Down swing.
Set a circle for head position, but it disappears as soon as i allow any movement.
I have the Annotation in the same file and have the.kva attached, why can't I retain the lines permanently.

2

For golf and other activities where the subject doesn't move it's typical to change the default by going to Options > Preferences > Drawings > Opacity > and check "Visible for the entire video".

In general people create different drawings at different times so the default is that the drawings fade away so they don't overlap each other.

You can also customize this behavior for each drawing by doing right click > Visibility.