Those lost icons are not part of the Roku Express interface.
They sound like part of your TV's home screen interface. Use your TV's remote, not the Express' remote, to change back to the TV's home screen.
Roku Community Streaming Expert I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well. If this post solves your problem please help others find this answer by clicking "Accept as Solution.".
Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X