Hi Saiyad Rahim,
I don't think this is possible. I am pretty certain there are no venets corresponding to Maintenance Module Schdule Edits. The SCOM 2019 Override and change tracking reports do not give you this option also (already tested).
Powershell also does not seem to be the way. There is a LastModified date, but not by who. also the Last Modified Date seem to only show when the MM Schedule was created, it does not reflect the exact time of an edit.
(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)
Regards
Stoyan Chalakov