diff --git a/common/data.ts b/common/data.ts
index 3696358..d7b1eb6 100644
--- a/common/data.ts
+++ b/common/data.ts
@@ -60,6 +60,10 @@ interface HeadingDecoratorSettings {
   unorderedLevelHeadings: string;
 }
 
+interface SourceHeadingDecoratorSettngs extends HeadingDecoratorSettings {
+  hideNumberSigns?: boolean;
+}
+
 export type HeadingPluginSettings = {
   metadataKeyword: string;
   folderBlacklist: string[];
@@ -69,7 +73,11 @@ export type HeadingPluginSettings = {
   enabledInSource: boolean;
   enabledInOutline: boolean;
   enabledInFileExplorer: boolean;
-} & Record<PluginDecoratorSettingsType, HeadingDecoratorSettings>;
+} & Record<
+  Exclude<PluginDecoratorSettingsType, "sourceSettings">,
+  HeadingDecoratorSettings
+> &
+  Record<"sourceSettings", SourceHeadingDecoratorSettngs>;
 
 export type HeadingPluginData = Omit<
   HeadingPluginSettings,
@@ -99,6 +107,7 @@ export const beforeDecoratorClassName = "before-heading-decorator";
 export const beforeInsideDecoratorClassName = "before-inside-heading-decorator";
 export const afterDecoratorClassName = "after-heading-decorator";
 export const afterInsideDecoratorClassName = "after-inside-heading-decorator";
+export const hideSourceNumberSignsClassName = "hide-source-number-signs";
 export const headingsSelector =
   ".el-h1 h1, .el-h2 h2, .el-h3 h3, .el-h4 h4, .el-h5 h5, .el-h6 h6";
 export const defaultHeadingTuple: HeadingTuple = [
@@ -184,6 +193,19 @@ export function defaultHeadingDecoratorSettings(): HeadingDecoratorSettings {
   };
 }
 
+/**
+ * Default source settings for source heading decorator.
+ *
+ * @returns default source settings for heading decorator.
+ */
+export function defaultSourceHeadingDecoratorSettings(): SourceHeadingDecoratorSettngs {
+  const settings = defaultHeadingDecoratorSettings();
+  return {
+    ...settings,
+    hideNumberSigns: false,
+  };
+}
+
 /**
  * Get unordered level headings from settings.
  *
diff --git a/components/view.ts b/components/view.ts
index 97aae8f..a8cf70d 100644
--- a/components/view.ts
+++ b/components/view.ts
@@ -13,6 +13,7 @@ import {
   getUnorderedLevelHeadings,
   getOrderedCustomIdents,
   findFirstCharacterIndex,
+  hideSourceNumberSignsClassName,
 } from "../common/data";
 import { Counter, Querier } from "../common/counter";
 import { Heading } from "../common/heading";
@@ -180,14 +181,45 @@ export class HeadingViewPlugin implements PluginValue {
             block: false,
           });
 
+          let hideDeco: Decoration | null = null;
+          if (!isLivePreviwMode) {
+            const hideNumberSigns = pluginData.sourceSettings.hideNumberSigns;
+            if (hideNumberSigns) {
+              hideDeco = Decoration.mark({
+                class: hideSourceNumberSignsClassName,
+              });
+            }
+          }
+
           if (position === "before-inside") {
             const charIndex = isLivePreviwMode
               ? findFirstCharacterIndex(lineText)
               : 0;
             builder.add(line.from + charIndex, line.from + charIndex, deco);
+
+            if (hideDeco) {
+              const cIndex = findFirstCharacterIndex(lineText);
+              if (cIndex > 0) {
+                builder.add(line.from, line.from + cIndex, hideDeco);
+              }
+            }
           } else if (position === "before") {
             builder.add(line.from, line.from, deco);
+
+            if (hideDeco) {
+              const cIndex = findFirstCharacterIndex(lineText);
+              if (cIndex > 0) {
+                builder.add(line.from, line.from + cIndex, hideDeco);
+              }
+            }
           } else {
+            if (hideDeco) {
+              const cIndex = findFirstCharacterIndex(lineText);
+              if (cIndex > 0) {
+                builder.add(line.from, line.from + cIndex, hideDeco);
+              }
+            }
+
             builder.add(line.to, line.to, deco);
           }
         }
diff --git a/main.ts b/main.ts
index 64c1675..2658654 100644
--- a/main.ts
+++ b/main.ts
@@ -20,6 +20,7 @@ import {
   headingsSelector,
   orderedStyleTypeOptions,
   defaultHeadingDecoratorSettings,
+  defaultSourceHeadingDecoratorSettings,
   getUnorderedLevelHeadings,
   getOrderedCustomIdents,
   diffLevel,
@@ -72,7 +73,7 @@ const DEFAULT_SETTINGS: HeadingPluginSettings = {
   enabledInPreview: true,
   previewSettings: defaultHeadingDecoratorSettings(),
   enabledInSource: false,
-  sourceSettings: defaultHeadingDecoratorSettings(),
+  sourceSettings: defaultSourceHeadingDecoratorSettings(),
   enabledInOutline: false,
   outlineSettings: defaultHeadingDecoratorSettings(),
   enabledInFileExplorer: false,
@@ -1348,6 +1349,27 @@ class HeadingSettingTab extends PluginSettingTab {
           })
       );
 
+    if (settingsType === "sourceSettings") {
+      new Setting(containerEl).setName("Other").setHeading();
+
+      //* hideNumberSigns
+      new Setting(containerEl)
+        .setName("Hide number signs on inactive lines")
+        .setDesc(
+          "Hide number signs (#) on inactive lines similar to live preview."
+        )
+        .addToggle((toggle) => {
+          toggle
+            .setValue(
+              this.plugin.settings[settingsType].hideNumberSigns ?? false
+            )
+            .onChange(async (value) => {
+              this.plugin.settings[settingsType].hideNumberSigns = value;
+              await this.plugin.saveSettings();
+            });
+        });
+    }
+
     //* Scroll back to the top
     containerEl.scrollTo({ top: 0, behavior: "smooth" });
   }
diff --git a/styles.css b/styles.css
index 125d45b..0fc2082 100644
--- a/styles.css
+++ b/styles.css
@@ -262,6 +262,14 @@ body {
 .custom-heading-decorator.source-custom-heading-decorator[data-decorator-opacity="100%"] {
   opacity: 100%;
 }
+
+.hide-source-number-signs {
+  display: none;
+}
+.cm-focused .cm-active .hide-source-number-signs,
+.cm-focused .cm-active .hide-source-number-signs {
+  display: unset;
+}
 /* source end */
 
 /* outline start */