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

Select the concerned Test from the home page and navigate to the Questions tab at the top.
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Click on the down arrow in the Section, to view all the questions of that section, or click on Expand All to view the questions in all the sections.
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Further, click on the pencil icon corresponding to the concerned question for which you want to allow the candidates to use only specific languages(s).
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Click on the Programming Languages tab visible in the editor.

Toggle the Restrict languages button ON and tick mark the languages you want to make available to the candidates, for that specific question.
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Finally, click on the Save Question button in the top-right corner, to save the changes.
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In case you want to allow all the languages for any specific question, you just need to Toggle the Restrict languages button OFF.

Navigate to the Test Window and select Settings > General.

Click on Reload Active Tests button.

This will ask the candidates to refresh their Test window so that the changes made will be reflected within their test.