Update build.func

misc/build.func

@@ -1095,8 +1095,8 @@ select_distribution() {
 
     while [[ -z "$var_os" ]]; do
         exec 3>&1
-
-        result=$(dialog --backtitle "[dev] Proxmox VE Helper Scripts" \
+        result=$(dialog --clear \
+            --backtitle "[dev] Proxmox VE Helper Scripts" \
             --title "DISTRIBUTION" \
             --radiolist "Choose Distribution:" 15 60 4 \
             "debian" "" $([[ "$default" == "debian" ]] && printf "on" || printf "off") \
@@ -1106,7 +1106,6 @@ select_distribution() {
             --extra-button \
             --extra-label "Back" \
             2>&1 1>&3)
-
         exitcode=$?
         exec 3>&-