Detailed Instructions: Given a sentence in the Japanese, provide an equivalent translation in Bahasa Indonesia that retains the same meaning through the translation. In translation, keep numbers as it is.
Problem:変化に対する彼らの意見によれば、図書館における操作がかなり厳格になったとのことだ。
Solution:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Pendapat mereka tentang perubahan-perubahan tersebut adalah bahwa operasi perpustakaan telah cukup diperketat.