With D365 v9 release, we have the new Unified Interface.
Observation:
When I started working with it, I observed that I cannot see the entity icons in the navigation even though I had uploaded but 16*16 and 32*32 icons for the entity.
I was also able to see the Entity icons in the web interface for the entity but not in the Unified Interface.
Solution:
In v9, we now have to specify the Icon for Unified interface separately. It is available in the Update Icons popup as a separate tab,
We have to update the icon in this area. The image size should be 16 *16, and it suggests that we should use SVG image for better results. I tried SVG and PNG images both, and both are working properly in the unified interface.
Suggestion in the Update icons section for Unified Interface:
“Select icons to use in the Web Client and Unified Interface. For best results, use a scalable vector graphic (.svg) icon with transparency enabled.”
Screenshots below for steps to update icons for Entity in the Unified Interface.
Somesh Dynamics Blogs 
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Enjoyed reading the article above , It really explains everything in detail and the post is interesting to read. Thank you very much for the information you shared. – Appointment Setting Services Christchurch, Appointment Setting Companies Christchurch
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I do get the icons in the side navigation, but if i go into an account for example and click on related to see the related (custom) entities, there are no icons. Do you know where i can configure those icons?
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