Hi Seven,
Search words “trebuchet launcher” across this forum produced results that answer your question in detail.
You can find apk’s to download yourself to install and try out or if you build the os there is info on how to enable the launcher in the build.
I don’t think there is an easy way for us to enable it on the device as it is. May be wrong.
There is an old universal version on an old xda thread that I have tried in the past and again just now. It works ok but one has to make one’s own mind up about downloading from there. The home settings are more generous than the current los version.