Op, only read all yr posts but it seems to me you feel " hemmed jn".
I am assuming yr home is quite small? You enjoy being with yr children but DH is encroaching on you? With kindness, that is also DH's home. If he is working from home now , that may be something out of his control. Your whole environment sounds claustrophobic.
You say you won't be leaving as you have young children so could move to a larger property benefit you all?
My now ex DH used to work from home 3 days a week, yrs ago. I did not love him anymore and so having him there jarred on me and the kids every time. I was working FT but he still annoyed me. He was a bit highly stung , not practical in terms of DIY, ( i did it all) he was messy and expected the children to behave like 1930's kids. He added to my mental load significantly. I was no longer attracted to him. I left and bought my own house for me and the DC's and it has been much better. We are not in a relationship anymore, we are divorced and single, he is a good hands on Dad but, i have my own lovely home and my own space.
With respect, i just don't think you are in love with yr Dh anymore , hence yr "i wont be leaving as we have young children " comment in yr first post. You are not happy Op. His constant presence is affecting you as , you do not want him there. He is basically getting on yr nerves.
Having young children does not stop you from leaving and having yr own home. Being attached to a certain lifestyle that yr DH's salary may afford you, does. Sounds to me like you will be happier in your own place. You need to either move to a bigger property, that gives you that space ( ExDH and I had a seriously massive large house but he still annoyed me) or you need to set up on yr own. This is not a space issue, this is not a wfh issue, this is a you are not happy in yr marriage issue.