To adjust the grain line:
On the Main toolbar, click Select.
On the Horizontal contextual menu, ensure Pieces is selected.
In the 2D window, click the piece whose grain line you want to adjust.
In the Context view, in the Actions section, type in the value you want for Grain Line Angle.
Version 2022.2 and newer
You can now flip a grain line with one click using the context view.
To flip a grain line:
In the 2D window, select the desired grain line.
In the Context view, select Line. The line options are displayed.
Under Transformation, use the flip buttons to flip the grain line to different directions.
The following image shows how to flip a grain line using the Context view.