Android Studio 3.5 - 缺少新的内存设置选项

Android Studio 3.5 - Missing new Memory Settings option

Android Studio 3.5 发行说明:

Android Studio now notifies you if it detects that you could improve  
performance by increasing the maximum amount of RAM that your OS should  
allocate for Android Studio processes, such as the core IDE, Gradle daemon,  
and Kotlin daemon. You can either accept the recommended settings by   
clicking the action link in the notification, or you can adjust these   
settings manually by selecting File > Settings (or Android Studio >   
Preferences on macOS), and then finding the Memory Settings section under  
Appearance & Behavior > System Settings.

这是我拥有的:

来自android studio configuration page

If you use a 64-bit system that has at least 5 GB of RAM, you can also adjust the heap sizes for your project manually.

可能是您的系统不满足这些要求。