diff --git a/ui/public/i18n/en/translation.json b/ui/public/i18n/en/translation.json
index 6683a84..75730e5 100644
--- a/ui/public/i18n/en/translation.json
+++ b/ui/public/i18n/en/translation.json
@@ -32,16 +32,19 @@
     "instance_configuration": "Configure {instance}",
     "configuring": "Configuration in progress...",
     "lets_encrypt": "Let's Encrypt certificate",
-    "domain": "User domain",
+    "domain": "LDAP User domain",
     "no_domain": "No user domain",
     "host_string_gte": "The host name can't be empty",
     "configure_nextcloud": "Configure Nextcloud",
     "host_invalid_type": "Invalid host name",
     "collabora_host":"CODE server host name",
-    "collabora_host_tooltip": "Type the host name of Collabora Online Development Edition server",
+    "collabora_host_tooltip": "Collabora Online Development Edition (CODE) is a self-hostable LibreOffice Online server. It allows you to edit office documents in a web browser.",
     "tls_verify_collabora":"Verify TLS certificate",
-    "collabora_placeholder": "Type a fully qualified domain name or choose an option",
-    "admin_password": "Password for user 'admin'"
+    "collabora_placeholder": "Select a collabora server or leave empty to disable",
+    "admin_password": "Password for user 'admin'",
+    "domain_tooltip": "A LDAP domain is used to authenticate users. If none LDAP user domain is listed you probably need to install one",
+    "choose_ldap_domain": "Select a LDAP user domain",
+    "host_placeholder": "E.g. mynextcloud.example.org"
   },
   "about": {
     "title": "About"
diff --git a/ui/src/views/Settings.vue b/ui/src/views/Settings.vue
index e41c2ee..93a5593 100644
--- a/ui/src/views/Settings.vue
+++ b/ui/src/views/Settings.vue
@@ -31,7 +31,7 @@
             </div>
             <cv-text-input
               :label="$t('settings.host')"
-              :placeholder="default_host"
+              :placeholder="$t('settings.host_placeholder')"
               v-model.trim="host"
               class="mg-bottom"
               :invalid-message="error.host"
@@ -63,18 +63,25 @@
                 $t("settings.enabled")
               }}</template>
             </cv-toggle>
-            <cv-combo-box
+            <NsComboBox
               v-model="domain"
               :options="domains"
               auto-highlight
               :title="$t('settings.domain')"
               :invalid-message="$t(error.listUserDomains)"
               :disabled="loadingUi"
-              :label="$t('settings.no_domain')"
+              :label="$t('settings.choose_ldap_domain')"
               light
+              tooltipAlignment="start"
+              tooltipDirection="top"
               ref="domain"
             >
-            </cv-combo-box>
+            <template slot="tooltip">
+                {{
+                  $t("settings.domain_tooltip")
+                }}
+                </template>
+            </NsComboBox>
             <template v-if="is_collabora && installed">
               <NsComboBox
                 v-model.trim="collabora_host"
@@ -84,7 +91,7 @@
                 :label="$t('settings.collabora_placeholder')"
                 :options="collabora_URL"
                 :userInputLabel="core.$t('common.user_input_l')"
-                :acceptUserInput="true"
+                :acceptUserInput="false"
                 :showItemType="true"
                 :invalid-message="$t(error.collabora_host)"
                 :disabled="loadingUi"
@@ -169,17 +176,10 @@ export default {
         hideClose: true,
       },
       host: "",
-      default_host: "",
       isLetsEncryptEnabled: false,
       domain: "",
       password: "Nethesis,1234",
-      domains: [
-        {
-          name: "nodomain",
-          label: "-",
-          value: "",
-        },
-      ],
+      domains: [],
       collabora_URL: [],
       installed: false,
       running: false,
@@ -303,6 +303,12 @@ export default {
         this.focusElement("host");
         isValidationOk = false;
       }
+      if (!this.domain) {
+        // test field cannot be empty
+        this.error.listUserDomains = this.$t("common.required");
+        this.focusElement("domain");
+        isValidationOk = false;
+      }
       // exclude characters not correctly supported by env file
       const re = new RegExp("\"|=|'|\\s|\\t");
       if (re.test(this.password)) {
@@ -383,7 +389,6 @@ export default {
       const config = taskResult.output;
       this.host = config.host;
       this.isLetsEncryptEnabled = config.lets_encrypt;
-      this.default_host = "nextcloud." + config.default_domain;
       this.running = config.running;
       this.installed = config.installed;
       this.is_collabora = config.is_collabora;