Except viewing the history of a record, SYSAdmin can also view the edit history for multiple sheets from Recent Changes, which can be found from Start Tab > Account Setup.
You can click on the modified records, to view details on additions and modifications.
To check all edits only on a sheet, you can apply filter from the Filter by sheet box.
Scroll down on the Recent Changes page, you can also find history of design changes for all sheets.
If you want to revert previous mass update, click the Revert Icon next to the history of a mass update.
Please note that it is not suggested to revert mass update if:
1. The design on related field(s) has been changed.
2. The Mass Update was made a long time ago.