Increase the limit on the number of columns in child table

How can I add more columns into the child table. I have removed the unused space to the left of the child table, now I need to increase the no of columns beyond 9.

11 is the total that you can increase up to. You would go to Customize>select the field you want to display, check the box to show in grid and then scroll down and assign a value in columns at the bottom. All the values must be 11 or less when added together.

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How to add more than 10 columns ?

You can’t.

Atleast not without rendering your own table using HTML. And JSON to store the values.