This command will spawn and instantly mount your character to the NPC with the specified ID. The NPC ID should be surrounded by apostrophes: instantMount('horse'), not instantMount(horse). Find a list of all NPC spawn codes at commands.gg/witcher3/npcs.
The syntax for the instantMount command is as follows:
This command has the following arguments:
|'NPC ID'||The ID of the NPC you wish to spawn and mount. You need to surround the NPC ID with apostrophes: instantMount('horse'), not instantMount(horse). See NPC IDs at commands.gg/witcher3/npcs.|
Find below working examples of the instantMount command.
This console command would spawn a horse and mount you on it.