If you want to lock the Test editor to prevent any further changes in the questions

Login to your WeCP account as a Recruiter or Hiring Manager.

Navigate to the concerned Test from the homepage.

At the top of the landing page, click on the Settings tab.
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Click on the General tab on the left pane.

Inside the General Settings window, toggle the Lock Test Editor button ON. This will prevent anyone from making any further changes to the Test pattern and the Test questions.
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If you want to Unlock the Test, Simply toggle the same button OFF. The Test will be editable again.

Don't forget to click on the Save Changes button at the top, to save all the changes.