- Posts: 221
- Joined: Sun Nov 23, 2014 8:26 am
- Location: Tokyo, Japan
Right-click in the panel and choose Options > Enable Marker Grab to disable it. You'll still be able to move markers by grabbing the flag at the top of the pane, but you'll no longer be able to grab the vertical line indicator.
edit: You have to do this separately for the Keyframes and Spline views.