To fix a marker position you can use the "lock smpte position" function.

- Create a marker
- Define a key command for the function "lock smpte position"
- Go to the marker list and select the marker
- hit the keycommand for "lock smpte position"

A padlock in the marker indicates, that the marker is locked. It cannot be moved accidentially.

Please note: Using this function, the marker is locked to its absolute position and no longer keep its bar dependent position when changing the tempo of the song.