My collegue comes to work sometimes, remote work is mostly still allowed. Everytime we pass by, he has to tab his screen of Lychess/Reddit away. And he's more

My collegue comes to work sometimes, remote work is mostly still allowed. Everytime we pass by, he has to tab his screen of Lychess/Reddit away. And he's more productive at work than at home.. Another collegue comes online before the Kanban, interrupts us at 12:05 ( when we eat) or at 17:35 on Friday or at 18:10. Just to show that's she's working "more". ( Hard to reach during normal hours fyi ) Ugh