I already posted this as an Issue on Github, but Miroslav confirmed that this is not a bug of Mirotalk. So probably it's an Issue with Cloudron?

Below, you can see my config.js of my Mirotalk SFU instance on Cloudron. Changes in the config.js to the UI don't affect the UI. Changes in other parts of config.js work (for example host protection). Could this be an issue with cloudron?

I don't know if this helps, but I found this in the Mirotalk Discord:

// All options at https://github.com/miroslavpejic85/mirotalksfu/blob/main/app/src/config.template.js

module.exports = {
    host: {
        /*
            Host Protection (default: false)
            To enhance host security, enable host protection - user auth and provide valid
            usernames and passwords in the users array.
        */
        protected: true, //protection works fine
        user_auth: false,
        users: [
            
            {
                username: 'usertest',
                password: 'passtest',
            }        
            
        ]
    },
    presenters: {
        /*
            By default, the presenter is identified as the first participant 
            to join the room, distinguished by their username and UUID.
            Additional layers can be added to specify valid presenters 
            and co-presenters by setting designated usernames.
        */
        list: [],
        join_first: true, // Set to true for traditional behavior, false to prioritize presenters
    },
    ui: {
        /*
            Customize your MiroTalk instance
        */
        brand: {
            app: {
                name: 'new app name',
                title: 'new app title',
                description:
                    'new app description',
            },
            site: {
                title: 'new site name',
                icon: '../images/logo.svg',
                appleTouchIcon: '../images/logo.svg',
            },
            meta: {
                description:
                    'meta description',
                keywords:
                    'meeting',
            },
            og: {
                type: 'app-webrtc',
                siteName: 'Newname',
                title: 'newTitle',
                description: 'new description',
                image: 'https://sfu.mirotalk.com/images/mirotalksfu.png',
                url: 'https://test.com/',
            },
            html: {
                features: false, //features will appear, eventhough this is false
                teams: true,
                tryEasier: true,
                poweredBy: true,
                sponsors: true,
                advertisers: true,
                footer: true,
            }
        }
        }
};