Open the list you want to edit.
Select the list item, right click, and then select Edit.
Next to the Text label, click the Pencil to display the Edit window.
Note that you can’t edit an enhanced rich text column in Quick Edit view.
Add text and format it any way you want (change the font, font size, font color, highlight, bold, italics, underline, bullet points, numbering, and so on.
For additional formatting options, click the ellipses (…) and select from the list.
If you would like to apply any of the formatting in the table below, select Return to classic experience at the bottom of the Edit window.
Features in the Classic rich text editor that are not supported in the Modern rich text editor:
Strike through text
Subscript, Super script
Left to right paragraph, right to left paragraph
Markup > Edit HTML source
Markup > Select elements on the page based on html elements
Markup > Convert HTML to XHMTL
Markup > Select a language
Insert > Table
Insert > Upload image to the site
Insert > Upload file to the site
Insert > Embed code
If you made any changes, click the Edit tab, and then click Save.