To search for a specific job, you can click on the magnifying glass icon in the top-right corner of your ‘My Jobs’ tab. This will open up a search bar and sorting menu for you - you can sort jobs in a number of different ways, including by date received, time remaining to complete the job, job status, and by jobs with unread chat messages.
To sort your jobs, you can click on the 3 Line Menu icon in the top-right corner of the "My Jobs" tab. This will open the sort options where you can sort by things like Name, Date Received, Time Remaining, and more. You can also sort in ascending or descending order.