This datapack adds a function to change the gravity of every entity. The menu is reachable trough /function sgrch:menu command.
Some Info ℹ️
You can get help from my Discord Server or creating an issue on GitHub.
If you for example installed 1.21.7 version of the pack to Minecraft 1.21.7 and it says it is not compatible, don't trust that message. You installed the right one. There was a bit of problems with the version :)
Better use the datapack because the mod can have problems.