diff --git a/ServerUI.gd b/ServerUI.gd
index dedd3bf..3706547 100644
--- a/ServerUI.gd
+++ b/ServerUI.gd
@@ -155,6 +155,8 @@ func set_server_running(running: bool) -> void:
 		document_date_lineedit.editable = false
 		document_title_lineedit.editable = false
 		document_input_textedit.readonly = true
+
+		_set_file_tree_disabled(true)
 	else:
 		server_status_label.text = SERVER_STATUS_TEXT.NOT_RUNNING
 		start_server_button.text = "Start server"
@@ -162,6 +164,7 @@ func set_server_running(running: bool) -> void:
 		document_date_lineedit.editable = !false
 		document_title_lineedit.editable = !false
 		document_input_textedit.readonly = !true
+		_set_file_tree_disabled(false)
 
 
 func _generate_filestxt():
@@ -235,6 +238,14 @@ func _get_file_content(path: String) -> String:
 	return content
 
 
+func _set_file_tree_disabled(disabled: bool) -> void:
+	var root = file_tree.get_root()
+	var tree_item = root.get_children() as TreeItem
+	while tree_item != null:
+		tree_item.set_editable(0, !disabled)
+		tree_item = tree_item.get_next()
+
+
 func _on_FileTreeContextMenu_id_pressed(id: int) -> void:
 	var idx = current_tree_selection.get_metadata(0)["id"] as int
 	var fd = working_files[idx] as FileDef