Hello,
You should take a look at a new user-friendly De-Dupe solution published on AppSource! Depending on your need it allows you to set up duplicate detection rules using standard Dynamics 365 functionality, but to review and merge duplicates in a completely renewed and comfy interface.
No more old, user-incomprehensible list of duplicates repeating with each merging step. Plus, since it has just been launched on AppSource, the solution is FREE of charge and includes support.
Feel free to visit Skyline Consultants website for more details skylineconsultants.com/.../.
Best,
Kristina