Add menu type: "Custom Tables - Catalog"

Click on Filter tab
and the parameter "Search Parameter", set it to "USER={currentuserid}", where "user" is the name field in your custom table where user ID is stored.

{currentuserid} will be replaced by the current user id automatically.

This is equal to MySQL query example:

SELECT * FROM #__customtables_table_formrequest WHERE es_user=123

"formrequest" is the name of the table, for example.

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