When ever a player logs out and back in they have to type out this command again to be able to open chest with solid blocks above them. Is there a way to make it so it remembers what people have toggled on/off? Or a way to set it defaulted on?
Thanks in advance.

Use the addon OITogglePersist to add persistent toggles. It is available from releases here on GH or as an additional file on Bukkit here: https://dev.bukkit.org/projects/openinv/files/5615798