Thanks. I configured the source using the setup wizard from the front panel. However, there's no soft key which corresponds to the new input, meaning that the only way to select it is by using the Meridian remote.

Is there a way to add the soft key using the setup wizard?

Meridian - G68J, UHD722, Rear Speakers: DSP5000s, Centre Speaker: DSP5000C
Naim - NDS, NAC52, NAP300, Front Speakers: SL2s
Other - Rega Planar 8, Lindemann Limetree Bridge II, HDfury 8K VRROOM, Panasonic DP-UB9000, Apple TV 4K, PS5 Pro, Xbox Series X, Nintendo Switch 2