DH is self--employed. Was working from a shared office, but gave it up when lockdown started.
We have a 'posh shed' at the end of the garden (previously TV/sofa/ gym equipment - mine and teen sons' hangout, basically). DH announced he would make that his office and gym equipment was moved to tiny boxroom upstairs where there is hardly any light and not enough room for me to do stuff on a mat 
.
Basically teens no longer able to use it for friends/ gaming etc during day (and it's lost some of its evening appeal, as now has an 'officey feel').
DH positioned his desk in the shed looking back up the garden towards the house. I now feel constantly watched during the day, and I feel uncomfortable sitting out on the terrace or having friends over with DH staring up the garden. He's made the occasional comment about 'how nice to have the time to read during the day etc' .
Anyway, for the last couple of days he's started setting up his laptop in the KITCHEN - spreading himself and his paperwork over the breakfast bar (which is also the main prep surface for any meal), taking and making phone calls and commenting on everything and anything - what time the teens are getting up/ what people are eating/ suggesting tasks he thinks people should be doing.
Honestly, it's doing my head in! Surely he's being unreasonable -he can't take over the whole house?
WIBU to tell him to p*ss off back to the shed, or give us our gym/TV room back? 
[P.S. I appreciate this is a first-world problem, and we're lucky not to be in a one-bed flat etc]