You probably created the layout in a universal mode or never actually replaced the background via the background dialog, so FancyMenu keeps layering on whatever the pack’s default background already provides.
Here’s what to check:
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Edit the layout “for the current screen”, not a universal one. The Title screen’s vanilla elements are only customizable in screen-specific layouts. Enable customization for the Title screen via the menu bar, then create (or “Save As”) a layout with “For Current Screen” selected.
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Set the background inside that layout:
- Right-click the editor background → Set Background.
- Choose your custom image/slide/panorama/etc. and click Configure Background to point it at
/config/fancymenu/assets/…. - Save the layout (Ctrl+S) and exit the editor.
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Disable any other layout still touching that screen (even universal ones) if they include their own backgrounds—backgrounds stack, so a layout with higher index or same screen might still show the “modpack” image on top. You can lower the layout index or temporarily disable other layouts via Customization → Layouts → Manage….
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Verify customizations are enabled for the Title screen. In-game, go to Customization on the menu bar and make sure the “Current Screen Customization” toggle is Enabled for the Title screen.
If the default image still shows, it’s probably coming from another layout (maybe shipped with the pack). You’ll need to disable or edit that layout so it doesn’t set a background anymore. For more details on setting backgrounds, see Menu Backgrounds.