Looks to me that you might have accidentally switched it to spectogram view
Right click on item, choose Spectral edits. Is Show spectrogram ticked? If so, untick it. Also, right click on TCP, check Track performance options ... tick Prevent spectrogram.
If that doesn't work, Options, Peaks display mode, Show normal peaks.
.... and if that doesn't work, View, Peaks display settings, Peaks
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