diff --git a/packages/widgets/src/blocks/legacy-widget/editor.scss b/packages/widgets/src/blocks/legacy-widget/editor.scss
index 8ad7a3faa5c330..c06f685cb20300 100644
--- a/packages/widgets/src/blocks/legacy-widget/editor.scss
+++ b/packages/widgets/src/blocks/legacy-widget/editor.scss
@@ -1,4 +1,5 @@
 .wp-block-legacy-widget__edit-form {
+	display: flow-root;
 	background: $white;
 	border-radius: $radius-block-ui;
 	border: 1px solid $gray-900;
@@ -130,6 +131,11 @@
 	}
 }
 
+// Wide widgets opening in popovers in the Customizer should have a min-width
+.components-popover__content .wp-block-legacy-widget__edit-form {
+	min-width: 400px;
+}
+
 .wp-block-legacy-widget {
 	.components-select-control__input {
 		padding: 0;