diff --git a/.changeset/panel-full-width.md b/.changeset/panel-full-width.md
new file mode 100644
index 00000000000..a845151cc84
--- /dev/null
+++ b/.changeset/panel-full-width.md
@@ -0,0 +1,2 @@
+---
+---
diff --git a/packages/mosaic/src/components/panel/panel.styles.ts b/packages/mosaic/src/components/panel/panel.styles.ts
index 18b83f92f02..c9e74458738 100644
--- a/packages/mosaic/src/components/panel/panel.styles.ts
+++ b/packages/mosaic/src/components/panel/panel.styles.ts
@@ -7,6 +7,7 @@ export const styles = stylex.create({
     gap: space['6'],
     display: 'flex',
     flexDirection: 'column',
+    width: '100%',
   },
   title: {
     display: 'block',