diff --git a/packages/editor/src/components/collab-sidebar/comments.js b/packages/editor/src/components/collab-sidebar/comments.js
index be877ce4222db..234be2254b91b 100644
--- a/packages/editor/src/components/collab-sidebar/comments.js
+++ b/packages/editor/src/components/collab-sidebar/comments.js
@@ -389,6 +389,7 @@ const ThreadWrapper = ( { children, clientId, classNames } ) => {
 	useBlockElementRef( clientId, blockRef );
 
 	const { y, refs } = useFloating( {
+		placement: 'right-start',
 		whileElementsMounted: autoUpdate,
 	} );
 
diff --git a/packages/editor/src/components/collab-sidebar/style.scss b/packages/editor/src/components/collab-sidebar/style.scss
index 2683ccd601798..e3bf2225ff8fb 100644
--- a/packages/editor/src/components/collab-sidebar/style.scss
+++ b/packages/editor/src/components/collab-sidebar/style.scss
@@ -21,6 +21,7 @@
 		border: 1px solid $gray-300;
 		background-color: $gray-100;
 		margin-bottom: $grid-unit-20;
+		width: calc(100% - 32px);
 	}
 
 	&__active-thread {