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If the original session date from & until is 1/22/2021- 2/28/2021 and you want to edit it. Change the Date until of the top range to the same until date of the session or more. See example below
To Deactivate
Change the date from and until (top). Click on the "edit" box. Select the row that you want to deactivate and click on active "no".
Click Submit when done.
To Reactivate
Change the date from and until (top). Click on the "edit" box. Select the inactive row that you want to reactivate and click on active "yes".
Click Submit when done.