The mod is inspired by Marlow's video, which shows a similar Elytra indicator. The mod adds a small hint under the crosshair to show whether Elytra is equipped.

ElytraIndicator Commands

/elytrahud offsetX

Sets the horizontal offset from the center of the screen. Positive = right, negative = left.

/elytrahud offsetY

Sets the vertical offset from the center of the screen. Positive = down, negative = up.

/elytrahud size <8-64>

Sets the icon size in pixels. Default: 16. Range: 8-64.

Source Code: https://github.com/ItsFlory/ElytraIndicator. Please star the project on GitHub.