Use the new experience dimension editor in books

The new experience dimension editor, which was previously available only on the modelling workbench, is now available in books.

To edit a dimension in the new experience editor, right-click a dimension on the Databases tree, then click Edit dimension

The classic dimension editor remains available in books. Right-click a dimension, then click Edit dimension (Classic) to edit a dimension in the classic editor.
The dimension editor on the dashboard

When you save a book with the new editor, you can reopen the book and retain your editor preferences in the same state as in the classic editor.

For more information on the new experience dimension editor, see Welcome to the new experience dimension editor.