Open the Tiling Pattern options for a selected tiling
Open the Tiling Pattern header in the Tiling Zone panel to reach rotation, pattern, tile size, grout line and material settings.
When a tiling is selected (its panel is titled Tiling Zone), the Tiling Pattern section starts closed: the panel shows Drawing Layer, Edit Shape, Tile Depth and the closed Tiling Pattern and Tiling headers.
A click on the Tiling Pattern header opens Rotation(deg) (with Rotate by 90 deg), Change Pattern, Change Tile Size, Grout Line (Grout Line Width and Grout Line Color) and Material.