By default, RIMMF displays cataloger-friendly labels for the elements in a record or template.
If you want to see the actual RIMMF Element name (which may be rather long and somewhat redundant at times), you may either enable display of the 'RIMMF Element' column (see How to Change the Columns that Display), or use this option, which pops-up the element name as a windows help-hint whenever you move the mouse over the associated label:
Note that this option is turned off by default.