Syndicated from - https://d365demystified.com/2019/07/12/change-the-unified-interface-app-icons/

Default App Icons for typical D365 environment look like these.

defaultAppIcons

But here’s what you can do to change these to put custom SVG icons.

SVG Icons

Regardless of dimensions, SVG icons work everywhere. So why keep them to just Ribbons, you can even change your App Icons to SVG Icons in your Dynamics 365 implementation.

  1. Make Web Resource for your SVG Icon.
    svgWebResource
  2. Open your Model Driven App in Dynamics 365 Solution. In the App Designer, go to Properties of the App itself and look for the drop-down above App Tile.
    defaultSalesIcon
  3. Select your SVG Icon and Publish the same
    newIcon.png
  4. And you’re set!
    updatedIconTile
    updatedIconSidebar

Hope this helps!