Thanks for reaching out! Here are the steps to customize and format tables in OneNote:

1. Open the table you’d like to customize in OneNote.
2. Choose your preferred table style from the Table Styles menu.
3. Use the Table Styles tools to adjust the layout, color and visibility of your cells.
4. Drag and drop the lines between cells to adjust the heights and widths.
5. Adjust the alignment and indentation of the table accordingly.
6. Click ‘Save’ when you’re done to apply your changes.