Then select “Custom size:” and fill in an appropriate size. Make sure the checkbox “Automatically managing paging file size for all drives” is not checked, as shown above.Click on “Settings.” You’ll see the performance options tab.Click on “Run as administrator.” You’ll see the advanced properties page:.(You can type all in lower case, too: “systempropertiesadvanced”.) You’ll see this:
On Windows 10, you can get directly to system properties from the task bar, but then you have to traverse several dialogs.