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+# Setting the App Font Size
+
+### Overview
+
+Based on the **Slider** component and **Preferences**, learn to drag the slider to set the app font size.
+
+The following figure shows the effect.
+
+![](screenshots/device/SetAppFontSize.en.gif)
+
+### Concepts
+
+- Font size setting principle: The **Slider** component is used to obtain the sliding value, and the value is persisted through **Preferences**. The font size on the page is adjusted based on the value.
+
+- Preferences: allows an app to process key-value (KV) data, including querying, modifying, and persisting the data.
+
+### Permissions
+
+N/A
+
+### How to Use
+
+1. The app contains two pages: Settings and Font Size Setting.
+
+2. There is a Back button in the upper left corner of the Font Size Setting page.
+
+3. You can access the Font Size Setting page by tapping the Font Size Setting option on the Settings page.
+
+4. When you drag the slider on the Font Size Setting page, the text on the Settings page and the Font Size Setting page change accordingly.
+
+### Constraints
+
+1. The sample is only supported on Huawei phones with standard systems.
+2. HarmonyOS: HarmonyOS NEXT Developer Beta1 or later.
+3. DevEco Studio: DevEco Studio NEXT Developer Beta1 or later.
+4. HarmonyOS SDK: HarmonyOS NEXT Developer Beta1 SDK or later.
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