Depends on what “usual” means.
My canton has a policy like this:
“You may list deductions (transport/commute, meals taken at work) as if you had gone to work normally throughout 2020 - but if you do, we are not accepting additional deductions for home office”
I think it is a special provision to reduce complexity - since it allows me to make deductions for expenses that (potentially) haven’t been incurred. Since these deductions make up a couple of thousands for me, it actually works in my favour and I’ll be silently absorbing additional costs for home office.
The catch with home office deductions is that they’re kind of hard to prove and argue anyway. As for computers and IT equipment, they’ll often assume you use it personally as well…