BTW the same code could be improved - it is hard to answer you question. Perhaps put real code and place some comments to better demonstrate problem

fun example(): List<String> {
            val conf = /* load configuration */
            
            if(conf.isSet("team_spawnpoint")) {
                val section = conf.getSection("team_spawnpoint.spawns")
                    ?: return@run
            }
            
            if(conf.isSet("all_spawnpoint")) {
                val section = conf.getSection("all_spawnpoint.spawns")
                    ?: return@run
            }
            
            return /*list of all valid spawn points*/
        }

Something like this where my function can possibly load spawn points for a specific team and can also load spawn points for people unassigned to a team, if the section in the configuration doesn't exist I'd like to just break out of the if clause.