I have had Evobox from Netia since December 2020. Since then, I have made several attempts to set up my own channel list. I did not find practically any descriptions in the manual or on the Internet, what was left was what someone suggested in this thread: the remote control in hand and click through the options in the decoder.
For now
I managed to define a list of favorite channels and when viewing the channel list I know how
set the filter so that only your favorites are visible . You can also define your own freely named channel lists. They appear for selection when filtering next to "Favorites". There is no way to change the channel order.
In my opinion, evobox support in terms of favorite channels, named channel lists and filtering is unintuitive. There are four different views of the channel list, each is handled a little differently, it's easy to get lost.
Now I'm throwing in a short basic tips for favorites. If there is anything unclear or more interest, I will take pictures of the TV screen of key places.
Tips: * filtering by list of favorite channels is not visible anywhere in the evobox start interface. Only after adding the first channel to favorites, this option becomes active, i.e. "Favorites" appears in various places of various channel filtering options. Previously, there is only "All", "Information", "Movie", etc.
* adding a channel to favorites can be done from several views, for example from EPG (EPG button on the remote control). There, when browsing the options, there is "Add to favorites" (or something like that)
* then, after adding one or more channels to your favorites, you just have to click various buttons on the remote control when you are in one of the several available views of the channel list. Up/down/right/left arrows to switch between subviews, 'options' button, sometimes OK
* as I mentioned, I still get lost in the multitude of options. You can view the channel list in several ways from different places. In one of these views, you can set default filtering. At the start, the default filtering is "All". There, I switched the filtering to "Recently viewed" and ... that's what I left in the decoder

I don't know how to go back to that view and change it to "Favorites" permanently.
To sum up: I added selected channels to the list of favorites, thanks to which I can switch to "Favorites" filtering in the EPG view. I don't know yet how to set "Favorites" filtering permanently as default. It's probably just a matter of time and re-clicking to accidentally get back to that screen where the default filtering is set.