diff --git a/src/editor/lsp/Popups.module.css b/src/editor/lsp/Popups.module.css
index 2c068e9d0..5663ef328 100644
--- a/src/editor/lsp/Popups.module.css
+++ b/src/editor/lsp/Popups.module.css
@@ -319,7 +319,13 @@
   white-space: pre;
 }
 
+.previewDialog [data-dialog-body] {
+  display: flex;
+  flex-direction: column;
+  overflow: hidden;
+}
 .previewSummary {
+  flex: none;
   padding: 10px 14px 6px;
   font-size: var(--fs-ui);
   color: var(--fg-muted);
@@ -328,7 +334,8 @@
   list-style: none;
   margin: 0;
   padding: 0 0 8px;
-  max-height: 320px;
+  flex: 1 1 auto;
+  min-height: 0;
   overflow: auto;
 }
 .previewRow {
@@ -358,6 +365,7 @@
 }
 
 .previewWarning {
+  flex: none;
   display: flex;
   align-items: flex-start;
   gap: 6px;
diff --git a/src/editor/lsp/Popups.tsx b/src/editor/lsp/Popups.tsx
index 451b95a5a..8f1228009 100644
--- a/src/editor/lsp/Popups.tsx
+++ b/src/editor/lsp/Popups.tsx
@@ -532,15 +532,42 @@ function DefinitionPopup({ popup }: { popup: Extract<LspPopup, { kind: "definiti
   );
 }
 
+const PREVIEW_SIZE_KEY = "openidea.refactor.previewSize";
+
+function loadPreviewSize(): { w: number; h: number } | null {
+  try {
+    const v = JSON.parse(localStorage.getItem(PREVIEW_SIZE_KEY) ?? "null") as { w?: unknown; h?: unknown } | null;
+    return typeof v?.w === "number" && typeof v.h === "number" ? { w: v.w, h: v.h } : null;
+  } catch {
+    return null;
+  }
+}
+
+function savePreviewSize(size: { w: number; h: number }) {
+  try {
+    localStorage.setItem(PREVIEW_SIZE_KEY, JSON.stringify(size));
+  } catch {
+    // Private mode etc. — the size just isn't remembered.
+  }
+}
+
 function PreviewDialog({ popup }: { popup: Extract<LspPopup, { kind: "preview" }> }) {
   const root = useProject((s) => s.project?.root ?? "");
   const { summary } = popup;
+  const [initialSize] = useState(loadPreviewSize);
   return (
     <Dialog
       open
       onClose={closePopup}
       title={popup.title}
+      className={styles.previewDialog}
       width={560}
+      minWidth={400}
+      minHeight={220}
+      maxHeight={480}
+      resizable="both"
+      initialSize={initialSize}
+      onResized={savePreviewSize}
       buttons={[
         {
           label: popup.confirmLabel,
@@ -586,7 +613,9 @@ function PreviewDialog({ popup }: { popup: Extract<LspPopup, { kind: "preview" }
             <li key={e.path} className={styles.previewRow}>
               <Icon name={fileIconName(basename(e.path), e.path)} size={14} className={styles.itemIcon} />
               <span className={styles.previewName}>{basename(e.path)}</span>
-              <span className={styles.previewPath}>{relativePath(root, e.path)}</span>
+              <span className={styles.previewPath} title={relativePath(root, e.path)}>
+                {relativePath(root, e.path)}
+              </span>
               <span className={styles.spacer} />
               {e.operation === "rename" && e.to && <span className={styles.previewOp}>→ {basename(e.to)}</span>}
               {e.operation && e.operation !== "rename" && <span className={styles.previewOp}>{e.operation}</span>}
diff --git a/src/editor/refactor/HierarchyDialog.module.css b/src/editor/refactor/HierarchyDialog.module.css
index 67aabcd9b..1c922715f 100644
--- a/src/editor/refactor/HierarchyDialog.module.css
+++ b/src/editor/refactor/HierarchyDialog.module.css
@@ -1,4 +1,12 @@
+.dialog [data-dialog-body] {
+  display: flex;
+  flex-direction: column;
+  overflow: hidden;
+}
+
 .body {
+  flex: 1;
+  min-height: 0;
   display: flex;
   flex-direction: column;
   gap: 10px;
@@ -8,6 +16,7 @@
 }
 
 .field {
+  flex: none;
   display: flex;
   flex-direction: column;
   gap: 6px;
@@ -23,6 +32,7 @@
   flex-direction: column;
   border: 1px solid var(--border);
   border-radius: 4px;
+  flex: 1 1 auto;
   min-height: 0;
 }
 
@@ -42,7 +52,8 @@
 }
 
 .rows {
-  max-height: 280px;
+  flex: 1 1 auto;
+  min-height: 0;
   overflow: auto;
 }
 
@@ -62,11 +73,13 @@
 }
 
 .hint {
+  flex: none;
   color: var(--fg-subtle);
   font-size: var(--fs-small);
 }
 
 .error {
+  flex: none;
   color: var(--danger);
   font-size: var(--fs-small);
   overflow-wrap: anywhere;
diff --git a/src/editor/refactor/HierarchyDialog.tsx b/src/editor/refactor/HierarchyDialog.tsx
index 97a0601cc..51fa2eb17 100644
--- a/src/editor/refactor/HierarchyDialog.tsx
+++ b/src/editor/refactor/HierarchyDialog.tsx
@@ -58,7 +58,11 @@ function HierarchyDialogInner({ request }: { request: HierarchyRequest }) {
       open
       onClose={close}
       title={titleOf(kind)}
+      className={styles.dialog}
       width={560}
+      minHeight={300}
+      maxHeight={560}
+      resizable="both"
       buttons={[
         { label: "Preview", role: "extra", disabled: !ready, onClick: () => void submit(true) },
         { label: "Refactor", role: "default", disabled: !ready, onClick: () => void submit(false) },