Simple: when running on older macOS, remove some items from the app menu. The solution is also straightforward, just very hard to locate.
AppKit
Swift Playgrounds are attracting a lot of young people to learn to code. But what do they do when they’re ready to write ‘proper’ apps? Where are Apple’s guides and example code?
An outline of how apps run, to help you fix their problems, and decide whether more memory would help.
The Eclectic Light Company 