A Table of Content can be formatted easily to make it more presentable. Font, font size, line space, etc. in a Table of Content can be controlled from the Styles gallery.

Procedure

1. Open your Word document.
2. On the Word Ribbon, click the Home tab.
3. Within the group Styles, click the dialog box launcher icon  on the right bottom corner. The Styles dialog box is displayed.
4. If your document has a Table of Content generated automatically, you can find the style controls TOC1, TOC2, etc. in the Styles dialog box for the corresponding heading levels 1, 2, etc. in the Table of Content (i.e. TOC1 represents first level heading, TOC2 second level heading, and so on.
5. To change the format of the first level heading in the Table of content, hover the mouse cursor over the style control TOC1. TOC1 is highlighted with a surrounding square box and a down-arrow button on the right.
6. Click the down arrow button. A drop-down list appears.
7. Click the Modify from drop-down list. The Modify Style dialog box appears. Here, you can edit font, font size, character type, color, etc.
8. If you want to edit even the paragraphs, border, tab related properties then click the Format button available at the bottom left corner and select a format type from the drop-down to edit.

You can also visit the following article to learn more about updating and formatting table of contents:

https://wordknowhow.wordpress.com/2013/03/28/updating-and-formatting-table-of-contents/

To create a table of content automatically, visit the following article in my blog:

https://wordknowhow.wordpress.com/2013/03/26/how-to-create-a-table-of-contents-automatically-in-word/