diff --git a/frontend/app/block/block.less b/frontend/app/block/block.less
index e48e1a2ce..2a355ae93 100644
--- a/frontend/app/block/block.less
+++ b/frontend/app/block/block.less
@@ -30,6 +30,7 @@
     align-items: center;
     justify-content: center;
     background-color: var(--panel-bg-color);
+    user-select: none;
 
     .block-header-text {
         padding: 0 5px;
diff --git a/frontend/app/workspace/workspace.less b/frontend/app/workspace/workspace.less
index 554c4fc72..8a1057c41 100644
--- a/frontend/app/workspace/workspace.less
+++ b/frontend/app/workspace/workspace.less
@@ -46,6 +46,7 @@
     height: 32px;
     border-bottom: 1px solid var(--border-color);
     flex-shrink: 0;
+    user-select: none;
 
     .tab {
         display: flex;