The only shift allowed on the left and right is a post offset, not a beam offset
You can offset your posts in a couple of ways
For both corner posts offset the same distance
Change corner posts to 'Notched' and enter the post offset distance required
To move posts independently of each other
Select the required beam and click 'Modify/Add Posts'
Click on the post and slide it to the desired position
You will notice the beam comes up with an error. To fix the error, confirm that your intermediate posts are 'NOTCHED'
