On Windows 11, even though the operating system is designed to use all the memory installed on your computer, you can limit how much RAM the operating system uses if you need to test software, troubleshoot issues, or simulate a lower-memory system.
However, the system doesn't include a simple setting to tell it to "only use 4GB of RAM." Instead, you have to use the legacy System Configuration tool (msconfig), which is intended primarily for testing and debugging.
