Your Telligent-powered community includes two types of editors: plaintext and enhanced, shown depending on the complexity of the content you provide for that context. For example, wiki pages include the enhanced editor but friend requests just a plaintext editor. When using the enhanced editor it may be helpful to you to use the fullscreen mode to aid in editing, particularly with pages with large amounts of content.
For Telligent Community (read more about how to use our enhanced editor):
For Telligent Enterprise (read more about how to use the enhanced editor):
This video is also posted here in the 5.x documentation: telligent.com/.../edit-in-fullscreen-mode.aspx