As usual, there are a couple of ways to do this. Start by selecting the cell or cells that contain the text you would like to rotate. Then go to Table > Cell Options > Text and in the dialog that opens, use the Text Rotation pop-up menu to select a degree of rotation. Alternatively, open the Table panel (Window > Type & Tables > Table) and look for the T icons in the lower-right area. Click on the T icon that is rotated to your liking, and the text in the selected cell will be rotated to the same degree.
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