diff --git a/public/howtouse.md b/public/howtouse.md
index a4b98d8367..f90bd232b3 100644
--- a/public/howtouse.md
+++ b/public/howtouse.md
@@ -236,10 +236,6 @@ GPU をお持ちの方は、音声の生成がずっと速い GPU モードを
   - 元に戻す
 - `Ctrl` + `Y`
   - やり直す
-- `Ctrl` + `+`
-  - 拡大
-- `Ctrl` + `-`
-  - 縮小
 - `Esc`
   - テキスト欄からカーソルを外す
 - 1
diff --git a/src/type/preload.ts b/src/type/preload.ts
index 67a03c5a53..a339b660fa 100644
--- a/src/type/preload.ts
+++ b/src/type/preload.ts
@@ -118,11 +118,11 @@ export const defaultHotkeySettings: HotkeySettingType[] = [
   },
   {
     action: "拡大",
-    combination: HotkeyCombination(!isMac ? "Ctrl +" : "Meta +"),
+    combination: HotkeyCombination(""),
   },
   {
     action: "縮小",
-    combination: HotkeyCombination(!isMac ? "Ctrl -" : "Meta -"),
+    combination: HotkeyCombination(""),
   },
   {
     action: "拡大率のリセット",