How to create a waiting lobby like in apex legends and fps?

And it can’t be like a host and join or something like that it must be a waiting lobby

Hello everybody, who can see this post please answer this question and please put like a video link or something like that but don’t put the third person videos couse the first person and third person templates are not the same and source folders will be much different and codes too. I don’t have any examples but I believe you will answer. And it may be created with GameLift Multiplayer and it can be UE4. Cya and ill wait for your answers.