Are you referencing the bottom say 1/6th of the Home screen (and other screens) where we expect a “Dock”, maybe with 4 (or so) favourite icons. Bliss includes a “Blurr” feature in the Dock. An explanation here Meet the Bliss Launcher -/e/OS’ default launcher - #39 by petefoth.
Some Wallpaper images may look a bit odd with the “Blur effect” (??). Perhaps try with a more plain wallpaper or a different Launcher [HOWTO] Start to customise /e/.