Hi TonyC109,
Thanks for sharing updates with us.
We would like to explain you when we type of column is Multiple lines of text, and by selecting ‘Rich text’ we need to press Enter to wrap them when editing**.**
In modern experience **** the Multi lines of text column (allowed type of text set to Plain text) only shows certain length of text. To check the whole content for this column, you can click the information icon on the ribbon > select the list item > Click See more on the right pane to check all the contents.
When we switch site to Classic View, we will see whole content for this column without clicking anything.
According to this article : Edit a rich text, list column in SharePoint Online by choosing the enhanced rich text column setting, you can customize the font color, size, or style or markup of the text.
we appreciate your understanding and time.
Best Regards,
Waqas Muhammad