I am happy with the current S4 Deco devices, although we feel that 3 nodes are too few, so we'd need more nodes to improve the coverage. But, can I connect other Deco models to our current Deco S4 mes

I have the newest firmware of deco s4 but i cannot find ANYWHERE how to MANUALLY connect to a deco device! It is super frustrating for my neighbor who keeps on automatically connecting to the deco dev