LineageOS used to have a function in the settings to activate and deactive the auto-start of apps inside Settings -> Apps if I recall correctly. I no longer find it in any setting option.
I'd like to avoid installing an extra app if there's a native function. The app in question is a RSS reader which I don't want to uninstall, but just not have running at every start.
I'm using LineageOS 14.1-20180203-NIGHTLY-titan.