I've had the 43" Hisense Roku since August.
However after Christmas we have more than 3 devices which includes xbox/switch/TV box that we're looking to add to the TV.
Is this possible or will we need to reset the settings everytime we want to switch from xbox to switch for example.
I'm not sure what you mean by "reset the settings", but you can get an HDMI switch that allows you to connect multiple devices to one HDMI input on the TV. Some have a remote and/or switch automatically to a device when it's turned on.