Bandwidth’s

I now have the panoramic wifi and I am trying to set up my MYQ garage door opener that will only use 2.4ghz and my phone has to be on same for setup but it automatically goes to best which is 5ghz is there a way to make it go to the 2.4ghz besides splitting the bands which is not recommended and if so do I have to split all three 2.4, 5 and 6 or can I leave 5 and 6 under 1 username and password