How to increase agent history rendering timeout in SSMS? We keep only 30 days of SQL agent job history but due to the frequent execution of jobs, SSMS will experience the following timeout error when trying to view history for a given job:
Execution Timeout Expired.  
The timeout period elapsed prior to completion of the operation or the server is not responding. 
(.Net SqlClient Data Provider)

Is there a way to increase this timeout in SQL Management Studio 18.7.1?
No unfortunately it is not possible. As @Newman mentioned, you can query the msdb.dbo.sp_help_jobhistory procedure to get the data back or you can adjust your jobs timeframe cutoff or total number of rows cutoff (whichever is more suitable to your business needs): https://docs.microsoft.com/en-us/sql/ssms/agent/resize-the-job-history-log?view=sql-server-ver15