diff --git a/config_panel.toml b/config_panel.toml
index 61d6b6f..e18cff6 100644
--- a/config_panel.toml
+++ b/config_panel.toml
@@ -7,19 +7,24 @@ name = "Roundcube configuration"
     name = "PHP-FPM configuration"
 
         [main.php_fpm_config.fpm_footprint]
-        ask = "Memory footprint of the service?"
-        choices = ["low", "medium", "high", "specific"]
+        ask = "Memory footprint"
+        type = "select"
+        choices.low = "Low, <= 20Mb per pool"
+        choices.medium = "Medium, between 20Mb and 40Mb per pool"
+        choices.high = "High, > 40Mb per pool"
+        choices.specific = "Use specific value"
         default = "low"
-        help = "low <= 20Mb per pool. medium between 20Mb and 40Mb per pool. high > 40Mb per pool.<br>Use specific to set a value with the following option."
 
-        [main.php_fpm_config.free_footprint]
+        [main.php_fpm_config.fpm_free_footprint]
+        visible = "fpm_footprint == 'specific'"
         ask = "Memory footprint of the service?"
         type = "number"
         default = "0"
         help = "Free field to specify exactly the footprint in Mb if you don't want to use one of the three previous values."
 
         [main.php_fpm_config.fpm_usage]
-        ask = "Expected usage of the service?"
+        ask = "Expected usage"
+        type = "select"
         choices = ["low", "medium", "high"]
         default = "low"
-        help = "low: Personal usage, behind the sso. No RAM footprint when not used, but the impact on the processor can be high if many users are using the service.<br>medium: Low usage, few people or/and publicly accessible. Low RAM footprint, medium processor footprint when used.<br>high: High usage, frequently visited website. High RAM footprint, but lower on processor usage and quickly responding."
+        help = "low: Personal usage, behind the SSO. No RAM footprint when not used, but the impact on the processor can be high if many users are using the service.<br>medium: Low usage, few people or/and publicly accessible. Low RAM footprint, medium processor footprint when used.<br>high: High usage, frequently visited website. High RAM footprint, but lower on processor usage and quickly responding."
diff --git a/scripts/config b/scripts/config
index 3440bd2..91c2de7 100644
--- a/scripts/config
+++ b/scripts/config
@@ -56,10 +56,10 @@ set__fpm_footprint() {
     fi
 }
 
-set__free_footprint() {
+set__fpm_free_footprint() {
     if [ "$fpm_footprint" = "specific" ]
     then
-        ynh_app_setting_set --app=$app --key=fpm_footprint --value="$free_footprint"
+        ynh_app_setting_set --app=$app --key=fpm_footprint --value="$fpm_free_footprint"
     fi
 }
 
@@ -70,11 +70,11 @@ set__free_footprint() {
 ynh_app_config_validate() {
     _ynh_app_config_validate
 
-    if [ "${changed[fpm_usage]}" == "true" ] || [ "${changed[fpm_footprint]}" == "true" ] || [ "${changed[free_footprint]}" == "true" ]; then
-        # If fpm_footprint is set to 'specific', use $free_footprint value.
+    if [ "${changed[fpm_usage]}" == "true" ] || [ "${changed[fpm_footprint]}" == "true" ] || [ "${changed[fpm_free_footprint]}" == "true" ]; then
+        # If fpm_footprint is set to 'specific', use $fpm_free_footprint value.
         if [ "$fpm_footprint" = "specific" ]
         then
-            fpm_footprint=$free_footprint
+            fpm_footprint=$fpm_free_footprint
         fi
 
         if [ "$fpm_footprint" == "0" ]