If I create a new blank project, then insert any type of track, let's say an audio track, in the Track pane, there will be one track. It will be numbered "1" and to the right of the "1" there is an audio track icon. Then, to the right of the audio track icon will be a text box with a default of "Track 1" in that text box. I can then double-click in the text box and change "Track 1" to anything I want. I can grab the right side of the text box and increase its width, but only so far. I can enter 2-3 times more text than can be displayed in the greatest width of the text box. If I hover over the text box with the mouse, the tool tip will show the entire contents of the text box. I'm not sure exactly how many characters are allowed, but certainly more than the text box width will support.
In previous versions of SONAR/Cakewalk (been a user since version 3 of Cakewalk), that text box could be widened to display the entire maximum width of the contents. Can't do that, as far as I know, in SONAR X2a.