The Candidate Handbook outlines the resource policy for each exam in the Exam Rules and Policies section - https://docs.linuxfoundation.org/tc-docs/certification/lf-candidate-handbook/exam-rules-and-policies. Please be sure to review the policy specified for the exam you're taking to understand what resources you are allowed to use / access during the exam:
https://docs.linuxfoundation.org/tc-docs/certification/certification-resources-allowed