If you are an Android user and looking out for the steps to change theme for Gmail app Android then start by opening Gmail app on device. Click on hamburger menu which is located at the top corner of the screen. Now, click to general settings and then click on theme located at the top. Lastly, click on dark. If the dark theme is already set then tap on system default. These are the steps that users need to follow to smoothly change the theme for Gmail app for Android devices.