I'm using Openwrt on a tp-link wdr4310 and have version 21.02.01 up and running.
I've installed the packages for Xray (xray-core xray-geodata) and was expecting to see a service menu appear in Luci to configure Xray, however this doesn't appear.
Anyone have any ideas on how to make this appear?
There doesn't appear to be a LuCI app for that. 
Does the Wiki say one of those packages install a LuCI app?
Looks like the v2raya might be the correct luci app.
This is actually the one I am trying, it installs correctly but the menu item doesn't appear:
Download the package using https://blog.mitsuha.me/file/luci-app-xray_1.5.2-1_all.ipk , then install it using opkg install luci-app-xray_1.5.2-1_all.ipk
Any ideas on how to fix this?
Ask the author? Third-party app from "mitsuha.me"...
Is the LuCI app supposedly (according to the author) compatible with your Luci version?
Ps. Have you already rebooted the router? That helps some times.
Yes - router rebooted. I'm contacting the developer on GitHub, any news I'll report back here. Thanks!