What is Table Text default size option in config.pro

Set the text size you want before you create the table. This will become the default text size for that table.

See this older community posting: Solved: Drawing Tables - New Table Row Text Size and Align... - PTC Community

Here is my conclusion:

Creo does not have config setting for text setup in tables.

Best Solution I prefer: Create table commonly used and copy paste it to new .dwg

Place the table in common general.dwg containing symbols, notes, tables.... etc.