Please note that Timeline menu and right click menu on the timeline is the same.
View commands
You can hide/show Timeline with Show Timeline
You can lock the The Viewer for changes with Lock Controls
You can hide/show description fields for the markers in the timeline with Show Marker Metadata
Show/Hide Scenes, Video Motion Rate and Plane Frames are related to Image Matching feature in Metus MAM. Please see # image matching
Master In/Out , Mark In/Out and Marker commands
Go To commands simply locates the cursor to the particular point/frame in the timeline.
You can use the Set commands to set your current frame/ cursor position as Mark In/Out or Master In/Out
For more information about the Marker commands, please see How to work with Markers - 3.7.1.0
Custom In/Out commands
Please see # how to work with Custom In/Outs