While I do not condone stealing time and not doing your job, for anyone who has a job without a lot of work that still requires you to look “busy” and are wondering how to get around the “people are suspicious because it says I’m online but I wasn’t responding” issue, set up a meeting for the time you’re up from your computer so teams will indicate you’re busy. Probably won’t work in a super small team where everybody knows whoever would be in a meeting with you, isn’t, though.