If you are interested to know about the table (in a particular database) that has most number of columns and how many columns.. You can run the below script..
SELECT NAME AS Table_Name, max_column_id_used AS Total_Columns From SYS.tables WHERE max_column_id_used = (SELECT MAX(max_column_id_used) FROM SYS.tables)
As shown in the below screen shot, it will list the table and the number of columns in that table..
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