I set mine up so I can work and supervise
So they might bake.
I let eldest read recipes and tell younger what to get and they mix up what and when. I sit at the table hiding behind laptop. Then I just do oven bit at end. Something like biscuits they can pass an hour or more doing but the time they make dough then cut or make the shapes they want (it's like edible play dough)
Outside. I tend to let them go straight out after breakfast for hour or so walk in parks in rain if we need to be in most the day, as then they are calm enough when home to do stuff
Set them up with train set/ Lego etc for 10 mins with them then leave them 30 mins and repeat.
Drawing or watercolours keeps occupied for ages. Baby can play on rug nearby or go in sling
If home schooling make each week a project. So say this week is knights and castles. Then boxs, pens and tape and scissors and let them make own castles. Drawings castle based ( can let them copy from books), ideally trip to castle or museum or similar at the beginning of week so they have ideas to go from. Biscuit dough they can mould into edible castles or Knights. Set up Lego as castle. Read books in between on same theme. Get them writing stories based on theme etc. adjust according to age.
Baby does whatever baby does in between so lays on rug/ in sling/ plays/ gets crayons as older