If you need to change the format of the texts of your table of contents you should follow these steps;
1- Click on the References tab.
2- In the Table of Contents part click on the Table of Contents.
3- Click on the “Custom Table of Contents…”.
4- In the Table of Contents dialogue go to the General section.
- In the Formats section, click on the arrow and choose “From template” item.
5- Click on the “Modify…” key.
6- In the Style dialogue, you can specify that you want to modify which level in the table of contents.
Here we chose TOC 1 for modifying the first level and then you click on the Modify.
Modify the style, font and other characteristics which you want.
Repeat these steps for other levels of the table of contents.
7- After you modify all the levels in your table of contents click on Ok.
8- Accept replace this table of contents.