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Click Settings on the home page of the mobile phone to enter the Settings page.
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Click on the application to enter the setting interface.
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Then click the icon in the upper right corner of the application interface.
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On the page that pops up, select the default application for the menu bar.
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After entering the default application list, select the home screen option to enter the corresponding page.
The button on the bottom screen of OPPO mobile phone needs to be called up in the system Settings. Enter the mobile phone 【 Settings 】-【 Convenient assistance 】-【 Navigation key 】, click and select 【 Virtual key navigation 】 to bring up the virtual navigation key of the mobile phone.