According to Blackboard there currently is no way to turn off weighting once
it has been activated. However, they did provide the following workaround for
"turning off weighting."
Basically, you create a gradebook item that is not visible to students and not
included in grade calculations. Then you set weighting to "by Item" and set
that invisible item you just created to 100% weight.
Here are step-by-step instructions:
Go to Control Panel>Gradebook
Click Add Item
Set the following in the Add/Modify Gradebook Item window:
Item Name: I suggest Turn Off Weighting so it will be easy to remember what this item was created for
Category: Other
Points Possible: 0
Make item available to users: No
Include in Gradebook Score Calculations: No
Click Submit.
In the Gradebook, click Weight Grades.
Select "Weight by Item"
Set the Turn Off Weighting item you just created to 100%