If the crosshair appears with a black background, setting Anti-Aliasing to (1) or (4) in settings often resolves the issue.
Many versions for Bedrock Edition include a Java UI pack, which mimics the layout and menus of the original Java version for a cleaner look. Rossweisse - Custom Sky 16x
Watch these tutorials and showcases to see the Rossweisse pack in action and learn how to install custom skies: If the crosshair appears with a black background,
On Java Edition, these mods are usually required to render custom skyboxes correctly. Rossweisse - Custom Sky 16x