I have configured Apex Class to run weekly for test, now I want to modify Apex Job Schedule, but I cannot find setting menu to modify already configured Apex Job Schedule.
How to modify?
You cannot update the scheduled jobs. You need to delete the existing job and then schedule it again.
To Delete existing job follow below step:
Setup -> Scheduled Job -> Job Name -> Delete
Now to schedule it again:
Setup -> Apex Classes -> Click on Schedule Job -> Select your class name and give other values
For more information check this link : https://salesforce.stackexchange.com/questions/104641/how-to-update-the-scheduled-jobs-in-apex#:~:text=You%20cannot%20update%20the%20scheduled,and%20then%20schedule%20it%20again.&text=You%20will%20see%20a%20%22Schedule,up%20the%20timing%20from%20there.