Node-red working again and I think I've found the cause of the upset and I will start a thread about it.
Still not able to increase font size though, I wonder if I copied and pasted the relevant parts of settings.js.old into user-settings.js would it work ?
Unfortunately, I think you need to reach out to Victron. I wonder if they've implemented Node-RED as an embedded version so I'm really not sure what is happening.
I use VenusOS on an RPi, when I did run Node-RED under VenusOS, it was reasonably up to date, but I did find that it was too many versions behind for what I was doing.
I decided to run VenusOS on a RPi Zero 2 W and NR, along with Mosquitto, on a Wyse/Dell3040 under DietPi. The system runs very stable. When using Monaco, you can adjust text size of the Function Node in the Monaco Editor Pane by using two fingers and drag diagonally apart/together. In all other Nodes this just magnifies the whole browser screen.
Unfortunately our Motorhome is in Storage, and that is where the setup is, so I can't test ATM. I know this doesn't help you, but it is an example of what can be done.
I've found three different files that contain settings, one or two have Monaco as the editor, one or two have Ace. Trouble is I don't know which settings file is the "real" one.
I can only zoom the entire page when making the two-finger drag.
I don't want to go to too much trouble as it really is just to allow easier editing of the function node which is not something I do every day.
You need to modify the third file (/data/home/nodered/.node-red/settings-venus.js).
The first file mainly contains the security configuration (for VRM). The second file isn't always present. If the third file doesn't exist, you can create it with your custom configuration. Even if the editor is defined in the first file, you can overwrite that configuration with the third file.
Can you share what you wrote in this third file?
The only annoying thing is that there's no log, or at least I couldn't find it. It's important to remember that the Cerbo has a weak point: its storage.
I thought I found the start-up log which is called "current" and have been trying to find a way to post it on here. Once I've got that capability under my belt I will post up the files but in my /data/home/nodered/.node-red/ I don't have settings-venus.js, only settings-user.js.
I think I may have seen settings-venus.js somewhere else though.
Just paste the text output from the start of the most recent run. It should with something like Welcome to node-RED. Just paste the first 20 or so lines from the welcome message or just before.
Actually today it looks like a list of nodes whereas yesterday when I was having access problems it had more interesting information. It might have been a different log that I found yesterday.