How to increase agent history rendering timeout in SSMS?
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