Samsung
Change the Edge Panel Handle Style auf Samsung
The Edge panel handle is the small bar you drag from the screen edge to open Edge panels. Samsung sets it to a plain black bar by default, which can clash with bright wallpapers or feel too small to grab reliably.
This handle is a display setting, independent from the panels themselves. Changing your theme, wallpaper, or the panel content will not move, resize, or recolor it, because the setting lives under the Edge panel display options.
To adjust it, go to Tap on Settings ➔ Tap on Display ➔ Tap on Edge panels ➔ Tap on Handle ➔ Set a Color, Transparency or Size. From there you can pick a handle color that stands out against your wallpaper, increase the size for an easier grab, or lower the transparency so it blends in more.
If the handle still does not respond well after adjusting these values, check that Edge panels are still enabled at all, since a disabled feature can make the handle disappear entirely rather than just look wrong. This setting only affects the handle itself, not which panels appear or their order.