For a more efficient deletion of one measure or more, use Edit, Erase From .. To. The dialog box will allow you to select whether it's the Melody or Soloist track, and how many bars to erase.

For areas not corresponding to a full measure, you could highlight the notes and do Edit, Cut. This works in the Editable Notation Mode or the Staff Roll Notation Mode.

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The notes representing RealTrack instruments would be regenerated each time you press Play. Even if you freeze the track, editing the notes would have no effect, so I guess it does make sense to disable the editing there (still trying to think of a reason why not). Plus, not all RealTracks even have notation; you can tell by looking at the underlining convention used on the green instrument name.

BIAB 2025 Win Audiophile. Software: Studio One 7 Pro, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus 192 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.