Since you are doing new install … try this … grab composer.json file and edit it
You want to edit the path where all the files would be.  Since I use cPanel so I edit mine to keep it all in public_html folder and I don’t know what the cloudpanel file structure are for hosting web sites and your edit may differ.
Here what my composer.json.  In cpanel the web sites are rootdoc are the /public_html/ folder. I had to use absolute path in composer.json for cpanel file structure because for some reason the relative  path wouldn’t work at all or threw a bunch of errors.
{
  "name": "mautic/recommended-project",
  "description": "Project template for Mautic 4 projects with composer",
  "type": "project",
  "license": "GPL-2.0-or-later",
  "homepage": "https://www.mautic.org/mautic-releases",
  "support": {
    "user-docs": "https://docs.mautic.org/en",
    "developer-docs": "https://developer.mautic.org",
    "chat": "https://www.mautic.org/slack"
  },
  "funding": [
    {
      "type": "other",
      "url": "https://opencollective.com/mautic"
    },
    {
      "type": "other",
      "url": "https://github.com/sponsors/mautic"
    }
  ],
  "authors": [
    {
      "name": "",
      "role": ""
    }
  ],
  "require": {
    "composer/installers": "^1.11",
    "mautic/core-composer-scaffold": "4.x-dev",
    "mautic/core-project-message": "4.x-dev",
    "mautic/core-lib": "^4.0",
    "mautic/grapes-js-builder-bundle": "^4.0",
    "mautic/plugin-citrix": "^4.0",
    "mautic/plugin-clearbit": "^4.0",
    "mautic/plugin-cloudstorage": "^4.0",
    "mautic/plugin-crm": "^4.0",
    "mautic/plugin-emailmarketing": "^4.0",
    "mautic/plugin-focus": "^4.0",
    "mautic/plugin-fullcontact": "^4.0",
    "mautic/plugin-gmail": "^4.0",
    "mautic/plugin-outlook": "^4.0",
    "mautic/plugin-social": "^4.0",
    "mautic/plugin-tagmanager": "^4.0",
    "mautic/plugin-zapier": "^4.0",
    "mautic/theme-aurora": "^4.0",
    "mautic/theme-blank": "^4.0",
    "mautic/theme-brienz": "^4.0",
    "mautic/theme-cards": "^4.0",
    "mautic/theme-coffee": "^4.0",
    "mautic/theme-confirmme": "^4.0",
    "mautic/theme-fresh-center": "^4.0",
    "mautic/theme-fresh-fixed": "^4.0",
    "mautic/theme-fresh-left": "^4.0",
    "mautic/theme-fresh-wide": "^4.0",
    "mautic/theme-goldstar": "^4.0",
    "mautic/theme-mauve": "^4.0",
    "mautic/theme-nature": "^4.0",
    "mautic/theme-neopolitan": "^4.0",
    "mautic/theme-oxygen": "^4.0",
    "mautic/theme-paprika": "^4.0",
    "mautic/theme-skyline": "^4.0",
    "mautic/theme-sparse": "^4.0",
    "mautic/theme-sunday": "^4.0",
    "mautic/theme-vibrant": "^4.0",
    "mautic/theme-trulypersonal": "^4.0"
  },
  "repositories": [
    {
      "type": "git",
      "url": "https://github.com/dennisameling/FOSOAuthServerBundle.git"
    }
  ],
  "conflict": {
    "mautic/mautic": "*",
    "mautic/core": "*"
  },
  "minimum-stability": "dev",
  "prefer-stable": true,
  "config": {
    "sort-packages": true,
    "secure-http": false,
    "allow-plugins": {
      "composer/installers": true,
      "symfony/flex": true,
      "mautic/core-composer-scaffold": true,
      "mautic/core-project-message": true
    }
  },
  "autoload": {
    "psr-4": {
      "MauticPlugin\\": "/home/cpanel-user/public_html/plugins/"
    }
  },
  "extra": {
    "mautic-scaffold": {
      "locations": {
        "web-root": "/home/cpanel-user/public_html/"
      }
    },
    "installer-paths": {
      "/home/cpanel-user/public_html/app": [
        "type:mautic-core"
      ],
      "/home/cpanel-user/public_html/plugins/{$name}": [
        "type:mautic-plugin"
      ],
      "/home/cpanel-user/public_html/themes/{$name}": [
        "type:mautic-theme"
      ]
    },
    "mautic-core-project-message": {
      "include-keys": [
        "homepage",
        "support"
      ],
      "post-create-project-cmd-message": [
        "<bg=blue;fg=white>                                                         </>",
        "<bg=blue;fg=white>  Congratulations, you’ve installed the Mautic codebase  </>",
        "<bg=blue;fg=white>  from the mautic/recommended-project template!          </>",
        "<bg=blue;fg=white>                                                         </>",
        "",
        "<bg=yellow;fg=black>Next steps</>:",
        "  * Install Mautic",
        "  * Read the user guide",
        "  * Get support: https://www.mautic.org/support",
        "  * Get involved with the Mautic community:",
        "      https://www.mautic.org/getting-involved",
        "  * Remove the plugin that prints this message:",
        "      composer remove mautic/core-project-message"
      ]
    }
  }
}