In this plates thickness are not visible.
Go to display option in top menu
You can open by clicking on display in top menu.
When we click on display option we get below dialog box display on screen.
Click on Draw icon in Display option dialog box.
There is Hidden option (Model) in left , click on it. On right, check-in on Plane Thickness. Than click on apply.
You will be able to see plates thickness in window.