Increase row count in search table in kibana dashboard

I have added discover search results in dashboard and changed row count limit to 500 default but it is not reflecting to search table.

Row count in search table is limited to 50.
How to increase that.

On the panel on the Dashboard, you will have a control on the bottom left where you can change the number of rows:

I am using version 7.4 and search result added from discover to dashboard. I didn't found any option there

Oh yes, 7.4 was a while ago. I'm afraid that option is not available on that version. I would suggest upgrading to one of 8+ versions.