Downloading & managing cores
Everything here lives under the CORES section of the menu, which has three views.
Download
Section titled “Download”A scrollable grid of every system RetroXR knows about, each showing how many cores are available for it.

Pick a system, pick a core, and it downloads in the headset. No PC, no unzipping, no copying files.
Where a system has an obvious best choice it is marked recommended.
Manager
Section titled “Manager”Once you have more than one core for a system, this is where you say which one it launches with. Systems are shown as a grid, each labeled with its current default.

This is also where core options live. Every core exposes its own settings — region, video filters, accuracy trade-offs, controller emulation — and you can change them here, or reset them back to the core’s defaults if you have made a mess.
BIOS / Extras
Section titled “BIOS / Extras”Which systems need firmware, which files exactly, and whether each is required or optional. It has its own page.
Updating and removing
Section titled “Updating and removing”Cores can be re-downloaded to pick up a newer build, and removed when you no longer want them. A system with no core installed simply cannot be spawned — that is the constraint you are managing.