The Track menu is where one can deal with the tracks, busses and control masters.

Height
Add Track, Bus or VCA…	Shows the `Add Track, Bus or VCA…` window, where one can add one or more tracks, busses or control masters to the session and define its parameters
Duplicate Tracks/Busses…	Shows the `Duplicate Tracks and Busses` window, allowing to duplicate the selected track(s) and optionally, its playlist
Toggle Record Enable	Sets the Record Enable mode On on the selected track(s). These tracks will record audio/midi next time the global record is active and playback is started.
Toggle Solo	Sets the solo On on the selected tracks, so only these tracks will play
Toggle Mute	Mutes the selected tracks, they won't play until unmuted
Insert Time	Shows the `Insert Time` window, allowing to insert a blank time in the selected tracks' playlist
Remove Time	Same as above, but to remove time
Move Selected Tracks Up	Changes the position of the selected tracks one track up towards the top. In the mixer, the tracks will be moved to the left.
Move Selected Tracks Down	Same as above, towards the bottom
Fit Selection (Vertical)	Will fit the selected track(s) in the window. If too many tracks are selected, they'll be reduced to their minimum height.
Largest	Sets the selected tracks height to a very high value, hence making the tracks wide on screen
Larger	Same as above, but a little less high
Large	Same as above, but again less high
Normal	Sets the height of the track to its default value which is a trade-off between readability and number of tracks displayed
Small	Reduces the size of the tracks to a low value, increasing the number of on screen tracks
Toggle Active	Toggles the active state of a track. An inactive track will be grayed and won't play any sound. That can be seen in the `A` column of the Tracks and Busses List
Remove	Deletes this track and its playlist (no file is harmed in the process, and the regions from the playlist stay in the Editor for later use)