Long time work from home (pre-pandemic) and recently adopted a lovely staffy, who's settling well.
I pop downstairs every 1.5/2 hours and either take him into the garden, or for a half-hour walk, at alternative times, which I'll build into one long walk once he's more settled. The rest of the time, the dog goes to his bed in the kitchen and seems to nap/peacefully wait (I have a camera). He's a chewer and will sit and chew on any ball/toy you give him to fetch, so can't interactive play with him, and no interest in Kong wobblers/treat dispensers.
Does this sound like your normal routine with a dog if working from home? I'm worried he's bored, but he isn't pacing or making a sound. Or do you have your dog in the office with you all the time? But I'm keen to avoid separation anxiety if I ever need to pop out as staffies can be a bit clingy.