Split Screen multiplayer player specific UI navigation

Hey, all
I am trying to create a local split screen multiplayer. So far I handled player spawning, saving and loading (from beginning and from last checkpoint, including vehicle selection persistency across levels, 2 modes, single player and local coop). Everything works fine, player death screen appears for the correct player, the one that died, but while in death screen, both players have control over the menu of the dead player. How would I be able to set the menu navigation similar to gears 5 (without lobby as it is only local coop)? Player 1 only navigates through the menu that is shown on his part of the screen (player 2 is not able to control player 1 widget navigation) and player 2 controls only his screen without player 1 being able to interfere. Please help, been struggling with this for the past few months…

PS: I also tried setting the according player controller owners and still nothing, they both navigate through the menu, regardless of ownership