Changing the code of the remote on the dm920 4k

I use two receivers in one room

One with a server is dm920 4k, the other is dm800 hd sim 3 for iptv

The problem is that the dm800's remote affects the dm920 4k

In the remote control of the dm920, I have two buttons right next to the batteries. 1 & 2

When changing their positions, there is no effect

I was told that in the receiver menu there was a change of address, but with mine with openpli there are no such options

Please tell me how the replacement works and how to make the remote on the dm800 not affect the dm920 4k

And with a change of code, won't a suitable image become

https://dmm-tv.com/dreambox/RCU10/

On DM800HD of the blacks is the big ones

This does not help me in any way

Anyway Thanks

That's what I'm asking how to do it