Memory recovering after working with Restore Points

Hello,
I rolled back the system to Restore Point and then undid it (using Windows tools), which resulted in approximately 60GB of disk space being lost. In other words, as a result of this “empty” operation, the status of the operating system itself did not change, but the memory disappeared. I cleaned the disk using the standard system tools and deleted ALL Restore Points (displayed in the list of available ones, except for the ones mentioned above, which had already disappeared by that time), but the disk space was not fully restored. Why is this happening? Are there other ways (third-party software) to effectively but safely clean up the local disk? How useful for this purpose could the Microsoft PC Manager app be: https://apps.microsoft.com/detail/9pm860492szd ?

Moreover, other users have a similar question:
https://learn.microsoft.com/ru-ru/answers/questions/4324939/question-4324939
https://learn.microsoft.com/ru-ru/answers/questions/3992426/8-1-70