I entered a transfer tuition amount but then deleted it. However, the tax summary still shows a transfer; it will not erase.

To remove the Tuition Credits being transferred to you from a dependant, in the sidebar of you TurboTax Online program go to: 

Deductions > Claims for Dependants > Tuition Amount Transfer. Then click "Enter Credit Info" next to the dependant who is transferring tuition to you. Be sure there is a checkmark beside "Transfer my child's tuition and education amounts", then continue to the Tuition Amount Transfer page where you can adjust or remove the entries.